Kumichou Musume to Sewagakari

Tooru Kirishima, nicknamed "The Demon of Sakuragi" is well-known throughout the underworld. His boss, however, is not impressed, and puts him in charge of the most difficult job of his life: to take care of Yaeka Sakuragi, the boss' seven-year-old daughter. At first, Tooru does not know how to handle Yaeka, and the young girl does not know how to express her feelings. But as time passes, the unlikely pair learn that family is more than just blood.

Tooru and Yaeka have to overcome their differences to understand each other. It's a difficult task, but the two of them get closer and closer as the days go by. In the end, Tooru discovers that being responsible for another life is a precious learning experience.