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Naomi is a university student who is leaving for the US to study in a week; Shuichi is a washed-up gumshoe who's hired by Naomi's father to bodygard his daughter until she leaves. Shuichi finds the job annoying and wants to quit. But he also has a screwed-up ex and alimony to pay. Things go from bad to worse when Naomi and Shuichi stumble upon a murder which might involve the yakuza. They decide to find out who committed the murder but God knows what it will lead to.

How to Watch Detective Story Legally and Safely

If you want to stream Detective Story through reputable and legal services, there are a few good options depending on where you are. Subscription platforms like HBO Max, Disney+, Netflix, Amazon Prime Video, and Apple TV+ sometimes carry Detective Story films or related DC titles—though availability depends on your country.

If you’d rather not commit to a subscription, there are ad‑supported, free (but legal) platforms such as Tubi, Pluto TV, Peacock or Crackle (where available in your region) that occasionally host superhero films.

Lastly, don’t forget about library‑linked streaming options like Kanopy or Hoopla (if your library or university is registered), and official uploads by film distributors on YouTube—these can also give you legal access to classic movies.