Deadman Wonderland (2011)

Anime series · Action & Adventure, Animation, Sci-Fi & Fantasy · 1 season · TMDB 7.5/10

Ganta is the only survivor after a mysterious man in red slaughters a classroom full of teenagers. He's framed for the carnage, sentenced to die, and locked away in the most twisted prison ever built: Deadman Wonderland. And then it gets worse.

Not on a subscription app in India right now.