Ten de Shouwaru Cupid

Japanese Title: てんで性悪キューピッド

English Title: Wicked Cupid

Plot
The storyline of Ten de Shōwaru Cupid follows Koinobori Ryuji, a sweet and introverted 15 year-old who lives with his four stepsisters and their father, the leader of the Koinobori yakuza and promiscuous playboy by heritage, just like his own father, grandfather, and so on. Ryuji's family has a tendency to make fun of his innocent nature, causing the boy to continuously try to run away from home. After escaping one day, Ryuji witnesses a beautiful girl with a devil tail bathing in a forest pool. Embarrassed, Ryuji returns to his home only to be confronted by girl the following day. As it turns out, this devil girl (named Maria) was hired by Ryuji's father to live with them in order to teach his son "the pleasures of the flesh" and make him follow in the family's perverted footsteps.