Light Novel, Otome Isekai, Yandere, Romance

Angelina spent most of her time in her room playing video games, until she transmigrated into the world of her favourite otome game... as an angel. Her favourite character, Zen, is there, but he's a demon. Upon that, her assignment is to investigate him and his family without them knowing. She goes undercover as a human attending the same school as them, trying to find out what is wrong. She becomes friends with Zen, but he and his brothers grow suspicious of her.

Angelina watches closely to see which route the heroine of the game is on. Zen, who is the yandere route in the game, watches Angelina closely.