https://preview.redd.it/h5yrhhm7k63e1.jpg?width=360&format=pjpg&auto=webp&s=f8a005a68a2e7b2c500875dc9e64ca2ec078add6

HELP ME I'VE BEEN LOOKING FOR THIS FOR YEARS: I'm looking for an anime where the protagonist lives in a reformatory or juvenile prison. One day, while running through the streets or inside the prison, he opens a door and travels to another dimension. In that new world, there are avatars (monsters) that fight each other. The protagonist has a tattoo on his arm with lines and circles where he keeps his avatar, which transforms into a ball when he's not in combat. The protagonist's avatar is green, has only one eye, I think, and looks like an angel with big wings or wings that become swords.

In one episode, his avatar merges with a red one-eyed avatar, which belongs to the villain of the series. Both avatars are similar and can be merged. Later, the protagonist finds his mother, who he thought had abandoned him since he was a child, but who is a little crazy. In one of the episodes, he gives his green avatar to her, since before him, the avatar belonged to his mother.

This anime is like Zetman, but with avatars that turn into balls inside tattoos on the arm. The protagonist has a hood or a long jacket, I think, and I think he physically resembles Kazuki Muto from Busō Renkin.