What to watch next
Anime like Gate Keepers 21
Matched on Contemporary Fantasy, Fantasy, Action, Magic. Titles that share more of these tags rank higher; ties go to the more popular show.
Frequently asked questions
What should I watch after Gate Keepers 21?
Fullmetal Alchemist: Brotherhood, Jujutsu Kaisen, Fate/Zero are the closest matches: they share Gate Keepers 21's main genres and have large audiences.
How are these picked?
Automatically, from genre and theme tags on Kitsu, weighted by how many tags overlap and then by popularity. No editorial opinion is involved, so treat it as a starting point.