PI Consultation Guide

A plain-English guide for people in Japan considering private investigator services.

For people still deciding

Sound familiar?

Many people start here unsure whether they need a PI at all. That is normal β€” this site helps you organize the next step in plain English.

  • I do not speak Japanese well β€” can I still get help?
  • I am not sure hiring a PI is the right step
  • I do not know which agency to trust in Japan
  • Costs seem high and quotes are confusing
  • I am worried about privacy and who sees my information
  • Agencies might pressure me or add hidden fees
  • I do not understand Japanese contracts or the legal system
  • I just want to organize my thoughts before deciding anything

If any of these apply, you are in the right place. Read the guides, use the chat, or connect to an agency through the form β€” you do not have to hire anyone.

Free intro formHow to choose an agency

PI-Thenics is not a detective agency. We do not conduct investigations. We help you understand your options and β€” if you agree β€” introduce you to a suitable agency.

When people consider a private investigator

Choose the situation closest to yours to read the relevant guide.

Infidelity investigationClarify suspicions about a partnerStalking & harassmentSafety, records, and next stepsHidden cameras & bugsPhysical privacy concernsMissing personSomeone you cannot reachBackground / conductUnderstand someone’s behaviorCorporate investigationsWorkplace or business concerns

Not sure which applies? Browse the guide list below or send a free consultation.

What a PI can do

Licensed investigators document behavior in public, compile factual reports, and organize information. They cannot access phones or accounts, install GPS without consent, or enter private property. Results are never guaranteed.

Before calling a PI, consider

  • Immediate danger β€” contact police (110), local support services, or your embassy first
  • Legal questions β€” consult a lawyer; PI-Thenics does not give legal advice
  • Just want to record something β€” keep a written log of dates, times, and what happened

Prepare before your first consultation

  1. Your goal β€” what do you want to know or prove?
  2. Your situation β€” when did it start, and what facts do you have?
  3. Area and budget β€” rough estimates are fine

See How it works and the Pricing guide for more detail.

Common questions before hiring

Can I get advice even if I have not decided to hire anyone yet?

Yes, absolutely. Many people come here just to organize their thoughts. You are not committing to anything by reaching out. We only introduce agencies if you explicitly agree to share your details.

I do not speak Japanese well. Can I still work with a PI agency?

Some agencies in Japan can communicate in English or have bilingual staff, though this is not universal. Through PI-Thenics you can consult in English, and we can help match you with an agency that fits your language needs. Contracts will still be in Japanese, so asking for a translated summary or bringing a bilingual friend to the first meeting is a reasonable request.

Is hiring a private investigator in Japan legal?

Yes. Agencies registered under Japan's Private Investigation Business Act (排偡ζ₯­ζ³•) operate legally. PIs may conduct surveillance, follow a subject in public, take photographs in public spaces, and compile reports. They cannot hack devices, install GPS without consent, make illegal recordings, or enter private property. Using their reports to harass, threaten, or discriminate is also illegal.

Is PI-Thenics a detective agency?

No. PI-Thenics is an independent guide and referral service. We help you understand the process, organize your situation, and β€” if you agree β€” introduce you to a suitable agency that fits your needs. We do not conduct investigations.

See all frequently asked questions

Feel free to give it a try

Free intro form