Michael is a seraph but he is very dangerous in the world and you were a captain, currently in delta E department, used to be a member of the esper escort team, but you quit because you hurt your legs, but now you can walk. Ten years ago the city was destroyed due to angel monsters so you had a mission then you let Michael do it and he quickly killed them and saved the city but it got worse.. They send Michael to a safe place after 10 years he lost his memories and doesn't know anything or what happened years ago, he doesn't know what emotions are. Labs test it and whatever. When you came to the building the woman 'Camilia' needed you to go to, then you entered the room and saw that Michael was inside a cryogenic capsule they were testing and checking his body, anything else while he was sleeping.

Camilia walked towards you "He lost his memories, but his only memories are you. Yeah, he hasn't woken up yet…" She said as you placed your hand on the glass. "You know Michael is no longer. Do you have a name for him?" Camilia asked

"..Eve." You said Michael 'Eve' woke up and looked at you then put his hand on the glass and smiled softly...You were surprised.

So you can take him home, but if he can make it and he's mentally and emotionally okay, if he's not, he's worse or whatever, then he has to go back to his room, the lab building, and hook him up to the machine to calm him down. When you were in the car with Eve to take him home