The second season leaves the manga and writes its own ending, and the third season then carries on as though the second had never happened.
Four seasons of twelve episodes each, and the second one is the problem. This site's recommendation is to watch the first season, read the gap the second season refuses to adapt, and then watch the sequel. The alternatives are set out under the list.
Seen some of these already? Tap the circles to tick them off. The full list below fills in as you go.
The only part of the anime that adapts the manga straight. It covers chapters 1 to 66 and ends in the middle of the story, which is normal for a first season and is not the fork.
The material that the anime never adapts. Root A starts from chapter 67 and then invents its own route to an ending, so the second half of the first manga series exists nowhere on screen, and it is what the 2018 sequel assumes you know.
Picks up two years after the manga's ending, with a new lead and a new unit. It follows the sequel manga and quietly ignores everything Root A introduced, which is why the reading step above is the one that makes it make sense.
Finishes the adaptation. It is heavily compressed, 179 chapters across 24 episodes in total, so expect events to arrive faster than they are explained.
Then what? If you would rather not read anything, there are two other ways through. Watch all four seasons in release order and accept that :re opens on a situation Root A did not set up, which is the option most people take and the one most streaming services imply. Or watch the first season only and read the manga from chapter 67 to the end of :re, which is what most manga readers advise, because the 2018 anime cuts a great deal. The two prequel OVAs and the two live action films are optional in all three cases.
A suggested way in, not an official one. The full list is below: tick anything off in either place.
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