Her angelic sister is a devil. She is welcomed by everyone, but she has a dark psychology, likes to lie, is shy, yandere, and has an extreme personality. She teases her sister from the beginning. Gradually, she becomes her sister's M, tolerating all the darkness. At the same time, she is attracted by her stepmother. Only then does she realize that her stepmother has been captured by her sister. The sister likes her sister's tolerance for her and is very jealous of her mother. - Okay, let's do this for now.