Monster Strike

Monster Strike (2015) is a action & adventure, animation, sci-fi & fantasy with 3 seasons, rated 4.8/10.

Ren Homura returns to his former residence, yet he feels very uncomfortable: he possesses no memory of having lived there. Without warning or his permission, a game called "Monster Strike" installs itself into Ren's smartphone; monsters of the game then literally fly out from his smartphone and start fighting on streets. Watching the fighting in amazement, Ren starts picking up his lost memories.