Flowers, Monsters, and a Girl

A boy became a monster. The monster met a girl, and the girl brought flowers.

A heartwarming story (perhaps), where everyone can be saved (probably), as they join hands and walk toward the light amid the ruins of the old world.

Most importantly, this is a story about seeking happiness.

(Ensemble cast, lots of focus on supporting characters, the protagonist is the villain's viewpoint in a sense, a little artsy, one female lead, lots of sweetness. Read at your own risk.)