A “prince” or the class president is a kind hearted man on the outside and at school but in reality he has a shit personality, and is also a Yakuza. So his father is a Yakuza boss, which is the KP of everything, so yea. But he gets found out by this girl by accident, and this is how he made her into his slave or lapdog, doing all of his duties for him. Until he finally realizes that he likes her and he still a ass to her but less of an ass and he starts to respect her too.
Kaichou-kun no Shimobe