The Best Mystery Anime You Can Watch Free (Updated July 2026)

Mystery anime is about airtight whodunits, unreliable narrators, and reveals that recontextualize everything before them. The problem is never finding titles — it's finding the ones you can actually start watching right now, legally, without a paywall or a shady stream. So we did the boring part: this list is every mystery series with official free episodes live on AnimeSphere as of July 2026, ranked by how much you can actually watch.

What's on this list

Right now there are 33 mystery titles with free episodes here — 125 free episodes in total. It's led by Cat's Eye, Sherlock Hound, Boogiepop Phantom, and runs deep into lesser-known picks worth your time. The ranking below is by episode count, so the shows near the top are the ones you can binge furthest before you hit a wall.

Why watch it free here

Everything on AnimeSphere streams from official, licensed sources — no piracy, no malware-laced pop-ups, no dead links. You can track what you're watching, get a notification the moment a new free episode drops, and when a title isn't free, we point you to exactly where it's legally streaming. It's the whole mystery shelf in one place, with a working play button on it.

Scroll down for the full ranked list — tap any cover to start watching.