When people consider an infidelity investigation
Suspicion of a partner's infidelity is one of the most common reasons people consult a PI in Japan. The goal is usually to confirm or rule out the behavior — not to make an accusation, but to have factual information before making a decision.
Common triggers include unexplained schedule changes, increased secrecy with a phone, unexplained expenses, or a shift in the relationship dynamic.
What a PI can do
A licensed investigator can conduct surveillance in public spaces, document a subject's movements and contacts with photographs or video, and compile a written report.
- Surveillance (following the subject in public)
- Stakeouts at known locations
- Photographic and video documentation
- Written investigation report
What a PI cannot do
Investigators may not:
- Access the subject's phone, apps, or email without consent
- Install tracking software or GPS without consent
- Enter private property
- Make recordings in private spaces
If you plan to use the report legally
If you are considering divorce or a compensation claim, speak with a lawyer before commissioning an investigation. The lawyer can advise what kind of documentation will be most useful, and the agency can tailor the report format accordingly.
Preparing for a consultation
Having this information ready will help an agency give you a useful quote:
- When you started noticing a change
- The subject's typical schedule and routine
- Area where surveillance would take place
- Your goal (rule out / confirm / prepare for legal action)
- Rough budget
Ready to organize your situation? Start a free consultation — no commitment to hire.
Frequently asked questions
Can I consult without any evidence yet?
Yes. Suspicion or unexplained changes are enough to start a conversation. You do not need proof before contacting us.
Is a result guaranteed?
No. Results depend on the subject's behavior during the investigation period. Any agency that guarantees results is making a promise they cannot keep.
Do I need a Japanese partner to deal with the agency?
Not necessarily. PI-Thenics can consult with you in English, and we try to match you with agencies that have some English capability. The contract will be in Japanese, so plan to have it reviewed.