The 2020 series looks exactly like a remake for four episodes. It is not one, and starting there destroys a fifty episode mystery.
Start at the 2006 series, episode one. There is no legitimate alternative entry point, and the newest entry is a trap that was built deliberately. The full path is 2006, then Kai, then Rei, then Gou, then Sotsu, which is 94 episodes.
Seen some of these already? Tap the circles to tick them off. The full list below fills in as you go.
Twenty six episodes. Four Question Arcs where a mystery is posed and everyone dies, then two Answer Arcs that re-run the same days with the withheld information supplied. The animation is rough and the writing is the point.
Twenty four episodes finishing the answers. Note that this does not re-adapt the two Answer Arcs the first series already covered; it moves on to new ones and resolves the loop.
Usually marked optional, and for anyone continuing to Gou it is not. Two of its five episodes are comedy, but the three episode Saikoroshi arc is direct groundwork for Satoko, and the author named Rei alongside the original series and Kai as what Gou and Sotsu culminate.
Twenty four episodes that begin by restaging the original's opening closely enough to convince you it is a remake, then diverge. Its entire method is deviation, so it is unreadable without the original to deviate from.
Fifteen episodes re-running Gou's arcs from other viewpoints with the culprit's actions shown, then a new finale. Gou ends mid-argument; stopping there leaves you with half a work.
Then what? Kira, Nekogoroshi-hen and Kaku ~Outbreak~ are genuine side content and can go after Kai or after Sotsu or nowhere at all. There is a fan convention that interleaves Gou and Sotsu arc by arc, and it should not be used on a first watch: Sotsu's first arc was written and aired after Gou had already revealed its culprit, so moving it to second position spoils Gou's central twist. It is defensible as a rewatch structure and nothing more.
A suggested way in, not an official one. The full list is below: tick anything off in either place.
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