Sachie Wakamura has just lost her mother, and her estranged grandfather has arrived to look after her. The only issue is that Grandpa leads a yakuza gang! Too frightened to join her new family, Sachie attempts to maintain her ordinary life. She cannot escape for long, however, because one of the most popular boys at school is a member of her grandfather's gang and serves as her new protector. No one at school is aware of Rakuto's secret life, and soon Sachie finds herself falling for her bodyguard. But she is the granddaughter of Rakuto's boss, and he can never reveal his feelings for her. Can Sachie find a way to fit into her new family and seize her chance at love?