Letting a friend stay for a few days can become a serious housing problem when the person remains longer, stops paying, keeps a key or refuses to leave. The safest response is usually a documented process that protects both your immediate safety and your own lease.
Quick answer: Do not assume that an invited guest is automatically a trespasser or that the police will remove them because their name is not on the lease. First preserve the messages and lease, end permission in writing, contact the landlord or management company, appoint a trusted local person to coordinate access and get Japan-specific legal advice if the person refuses to leave. Call the police for an emergency, threats, violence, property damage or suspected crime—not as a substitute for resolving an uncertain civil occupancy dispute. This guide focuses on rented apartments in Japan, especially the kind of Tokyo arrangement described here.
Editorial note: This article uses an anonymized summary of user-provided material. Identifying details and community comments have not been reproduced. This article provides general information, not legal, tenancy or immigration advice.
A Concrete Scenario
Imagine a student who has rented an apartment in Japan for several years and leaves the country temporarily. Before departure, the student gives a friend permission to stay for up to one week and expects payment for that period. The friend remains for roughly three weeks, gives changing explanations, does not pay as expected and still has access to the apartment.
The tenant is abroad and will not return for several weeks. Messages document the original understanding, but there is no formal sublease. A friend has already tried to speak with the occupant. The tenant is worried about the key, possible damage, the landlord discovering an unauthorized occupant and whether any money can be recovered.
That combination creates two separate problems:
- The immediate access and safety problem: Who is in the apartment, what permission remains, who has keys and whether there is an urgent threat?
- The contract and money problem: Did the tenant breach the main lease, was there a valid payment agreement, and what losses can be proved?
Solve the first problem in a controlled way before deciding how aggressively to pursue the second.
The Facts That Change the Analysis
| Question | Why it matters | Evidence to collect |
|---|---|---|
| Do you rent or own the apartment? | A tenant may have a landlord, management company and lease restrictions that an owner does not. | Main lease, building rules, management contacts and any permission for guests or subletting. |
| What exactly did you permit? | A short visit, house-sitting, a room, exclusive possession and a paid stay can create different facts. | Messages, dates, keys, written instructions and the original reason for the stay. |
| Was payment agreed? | A promise to reimburse or pay for a defined period is different from an assumption that rent is owed. | Amount, due date, payment method and messages acknowledging the agreement. |
| Has permission been revoked? | The person may not understand that the arrangement has ended unless you state it clearly. | A dated written notice, delivery record and response. |
| Who has keys or access codes? | Returned keys do not prove that copies or active codes no longer exist. | Key count, building access rules, smart-lock logs and manager instructions. |
| Is there an immediate risk? | Violence, threats, fire hazards, serious damage or suspected illegal activity may require urgent help. | Specific observations, dates, photos from lawful locations and incident records. |
No mail, no residence registration and no name on the lease are not reliable shortcuts to the answer. They may be relevant facts, but they do not by themselves determine whether the person is an invited guest, an occupant, a subtenant or someone who can be removed immediately.
First Priority: Protect the Main Lease
If you are a tenant, read the clauses on guests, occupants, assignment, subletting, notice, keys, security and landlord access. The Japanese Ministry of Land, Infrastructure, Transport and Tourism's standard rental housing contract is a model form rather than a mandatory contract, but it is useful for seeing the kinds of issues a residential lease may address.
Japan's Civil Code Article 612 states that a lessee may not assign the lease or sublease the leased property without the lessor's approval. It also provides a cancellation rule when a lessee violates that restriction. The official Japanese Law Translation of the Civil Code is a starting point, not a determination that every temporary guest is a subtenant.
That distinction matters. Letting a friend sleep in an apartment for a short time may not automatically be the same as creating a sublease. But a longer stay, exclusive possession, payment, keys and an agreement that the person can use the apartment in your absence can create facts that the landlord or a court may treat seriously.
Do not hide the problem or invent a story about the arrangement. Contact the landlord or management company, explain the facts accurately and ask:
- whether the lease allowed the temporary stay;
- whether the manager can inspect the apartment or coordinate with your representative;
- what the building requires for a lock change or key replacement;
- what to do if the occupant refuses access or remains after permission ends; and
- how to report damage, smoking, noise, unauthorized guests or other building-rule concerns.
The disclosure may create risk for your own tenancy. That is real. So is the risk of letting an unauthorized occupant remain and hoping the issue disappears. Ask a Japan-qualified lawyer or legal-support service to help you choose a response based on the actual lease.
If You Are Abroad, Use a Controlled Local Process
Being outside Japan does not mean you have no options, but it changes who should act in person.
1. Preserve the evidence before arguing about the money
Save the original lease, messages, bank records, key handover details, photographs, building emails and a dated timeline. Export conversations in a form that preserves dates and participants. Do not edit the messages to make them look more formal.
Create separate headings for:
- permission granted;
- agreed end date;
- payment promised or requested;
- permission revoked;
- requests to leave or return keys;
- damage, cleaning or missing items; and
- contacts with the landlord, manager, school, police or legal adviser.
2. End permission in clear written language
Use a calm message that states the facts and a deadline. Do not threaten deportation, public exposure, academic punishment or physical force. A plain-language message might say:
This message confirms that my permission for you to stay at [apartment] ends on [date and time]. Please leave the apartment, return every key and access device to [person/manager] and confirm your move-out time in writing. Do not invite anyone else or remove my property. I am arranging for the landlord/management company or my authorized representative to coordinate access. Any payment, damage or cleaning issue will be documented separately.
This is a communication template, not a substitute for a formal Japanese notice. If the occupant is asserting a right to stay, has belongings throughout the apartment or refuses the deadline, obtain legal advice before taking physical action.
3. Authorize one local person, not a crowd
Give a trusted person written authority to communicate with the management company, attend an inspection, receive keys and document the condition of the apartment. Share only the information they need.
That person should not threaten, search, remove belongings, shut off utilities or try to physically eject the occupant. If an in-person visit is necessary, coordinate with the landlord or manager and use a neutral witness. Do not send several friends to pressure someone at the door.
4. Ask the landlord or manager to control access
The building manager may be the best person to explain the permitted process for inspection, access codes, key replacement, emergency entry and damage reporting. If the tenant is abroad, ask whether the manager will communicate directly with the occupant and what written authorization is required.
5. Escalate urgent risk through the right channel
If there is immediate danger, violence, threats, a fire risk or an active crime, use the local emergency channel. The Tokyo Metropolitan Police states that 110 is for accidents or crimes and #9110 is available for non-emergency police consultation, with English support noted on the page.
If the concern is an uncertain right to remain after an invitation, do not assume the police will decide the tenancy question on the spot. Tell them the specific facts—threats, damage, violence, suspected crime or immediate safety risk—rather than simply saying “this person is not on my lease.” For the possession dispute itself, contact the landlord, a Japan-qualified lawyer or legal-support service.
Do Not Use Self-Help Removal Tactics
The most tempting actions can create a second dispute:
- changing the locks while the occupant is inside;
- putting the occupant's belongings outside;
- shutting off electricity, water or internet to force a move;
- entering the apartment without checking the access rules;
- confronting the person alone or sending friends to intimidate them;
- searching their bags or private space;
- making public accusations about drugs, immigration status or criminality; or
- telling the school or landlord facts you cannot prove.
These actions can escalate the situation, damage your lease position or create new evidence against you. The fact that you originally gave a key does not answer whether you may later revoke access through a particular process. Get local advice before taking a step that changes possession or removes property.
Treat Suspected Drug Use as a Safety Issue, Not a Debate
If you discover credible evidence of controlled-substance use or possession, do not search the apartment, seize items or confront the person about criminal penalties. Preserve what you lawfully know, notify the landlord or manager about any safety or building risk, and contact the police or legal adviser when the facts justify it.
Do not assume that a smell, rumor or message proves a specific offense. Do not use the threat of police or immigration consequences as leverage to collect money. If there is an immediate danger, call emergency services; if not, ask a lawyer or police consultation channel how to report the information safely.
What If the Person Leaves Before You Return?
A voluntary departure is the cleanest outcome, but it does not end the checklist.
Ask the manager or authorized representative to:
- confirm the person has left;
- recover every issued key, fob and access device;
- document the apartment’s condition with dated photographs;
- note missing items, smoke odor, damage or unusual cleaning needs;
- report issues through the landlord’s required channel;
- ask whether locks or access codes should be changed; and
- preserve messages showing the move-out and key return.
Do not assume a returned key means no copy exists. Ask the landlord or manager what lock-change process the lease and building require, and who must pay for it. If the occupant left personal belongings behind, do not discard them without advice about notice, storage and collection.
Can You Recover the Money?
Treat money recovery as a separate evidence question, not as permission to self-evict.
Start by classifying the amount:
- payment expressly agreed for the original stay;
- payment agreed for the extra days;
- utilities, cleaning or repair costs;
- replacement keys or lock costs; or
- a penalty that was never clearly agreed.
The stronger the written agreement about the amount, period and due date, the easier it is to explain the claim. But the claim can still be affected by the main lease, any unauthorized subletting, the legality of the arrangement, proof of loss and the other person’s ability to pay.
Send a separate, factual accounting after the access and safety issue is under control. Give the person a reasonable way to dispute the amount and keep the communication free of threats. Ask a Japan-qualified lawyer whether a demand letter, mediation or court claim makes sense.
For a money claim of up to ¥600,000, the Supreme Court of Japan's English summary-court guidance describes the small-claims procedure. It lists contract fees, repair charges and some rent-related claims among examples of money disputes. A small-claims process does not guarantee that the court will accept your evidence, that you will win or that the other person can pay. It also does not replace a lawful process for recovering possession of an apartment.
Get Japan-Specific Help in a Language You Can Use
If you are a foreign resident or are handling the matter from abroad, language and procedure can make a small problem feel much larger. Houterasu's Multilingual Information Service provides information about the Japanese legal system and can connect users with relevant consultation channels. Its pages also explain that eligibility for civil legal aid depends on residence and other conditions.
Ask for help with the exact questions:
- Is the arrangement a guest stay, unauthorized occupancy or sublease under the lease and facts?
- What notice or process applies if the person refuses to leave?
- Can the landlord or manager act while the tenant is abroad?
- What can an authorized representative do safely?
- Is the payment claim worth pursuing after considering evidence and cost?
- What should happen to keys, belongings and the condition report?
The landlord or management company may also have a preferred bilingual contact or a procedure for absent tenants. Use that channel early.
A 48-Hour Remote Action Plan
Hours 0–4: Preserve and classify
Save the lease, messages, payment records, key details and photos. Create a one-page timeline. Identify any immediate danger or serious property risk.
Hours 4–12: Write and notify
Send a clear end-of-permission message. Contact the landlord or manager with an accurate summary and ask what they require from an overseas tenant. Do not negotiate a new stay or payment arrangement casually by phone.
Hours 12–24: Appoint and protect
Choose one local representative. Give written authority for communication, inspection and key handover. Arrange a neutral witness or manager-led visit if appropriate.
Hours 24–48: Get advice and choose the track
Speak with Houterasu, a Japan-qualified lawyer or the relevant police consultation channel. Decide whether the situation is a voluntary move-out, a landlord-managed lease issue, a safety report or a civil possession dispute. Keep money recovery as a separate track.
Where Pine Fits
Pine can help organize the apartment lease, messages, payment records, key history, written demands, manager emails, photographs and incident notes into a dated timeline. It can identify unanswered questions and prepare a concise document list for the landlord, management company, Houterasu, lawyer or police consultation.
Open Pine to organize the evidence and next steps before sending another message or authorizing an in-person visit. Pine does not decide tenancy status, provide legal advice, contact the police or guarantee removal or payment.
Frequently Asked Questions
Can the police remove a friend who refuses to leave my apartment in Japan?
Do not assume so. Police can respond to emergencies, crimes, threats and immediate safety concerns. When the person was originally invited, whether they can be removed immediately may depend on permission, lease terms, possession and other facts. Contact the landlord or manager and obtain Japan-specific legal advice for the civil occupancy issue.
Does the fact that the person is not on the lease make them a trespasser?
Not automatically. A person who was invited to stay has different facts from someone who entered without permission. The lack of a lease, mail or residence registration may be relevant, but it does not by itself decide the legal status or removal process.
Is letting a friend stay the same as subletting?
Not necessarily, but the distinction depends on the actual arrangement. Payment, exclusive possession, length of stay, keys, control of the apartment and the main lease all matter. Japan's Civil Code restricts assignment or subleasing without the lessor's approval, so check the lease and get local advice before assuming the arrangement is harmless.
Should I change the locks while the person is away?
Do not treat that as an automatic solution. If the person still claims a right to occupy the apartment or has belongings inside, a unilateral lockout can create additional risk. Coordinate with the landlord or manager and obtain local legal advice. If the person has clearly vacated, ask the building about the approved lock-change process.
Can I shut off utilities to force the person out?
Do not do this. Utility shutoffs can escalate the dispute and may create separate legal or safety problems. Use the landlord, manager, police or legal process appropriate to the facts.
Can I tell the school or threaten immigration consequences?
You may ask a school’s student-support or international office whether it has a safe mediation or welfare channel, but do not use academic, immigration or public-exposure threats to force payment or removal. Share only accurate, necessary facts and ask a lawyer about privacy and defamation risks.
Can I sue for the unpaid stay?
Possibly, but a claim depends on the agreement, evidence, lease restrictions, legal theory, amount and ability to collect. Japan’s courts describe small-claims proceedings for money claims up to ¥600,000, but a court process does not guarantee recovery and should be evaluated against cost and risk.
What should I do if the person has already left?
Confirm the move-out, recover keys and access devices, document the apartment’s condition, contact the landlord or manager, and ask about lock changes and abandoned belongings. Then decide separately whether any documented payment or damage claim is worth pursuing.
Official Sources
- Japanese Law Translation: Civil Code, Article 612
- Japan Ministry of Land, Infrastructure, Transport and Tourism: Standard Rental Housing Contract
- Tokyo Metropolitan Police: 110 and #9110
- Houterasu: Multilingual Information Service
- Supreme Court of Japan: Questions and Answers on Civil Proceedings in Summary Court
- Immigration Services Agency of Japan: Notification of Address
This article provides general information, not legal, tenancy, immigration, police or financial advice. Japanese tenancy and civil procedures depend on the lease, permission, possession, evidence, location and the facts of the dispute. Confirm the next step with the landlord or manager and a qualified Japan-based professional before changing locks, removing property, confronting an occupant or filing a claim.
