When Sachie Wakamura lost her mother, her estranged grandfather showed up to take care of her. The only problem is that Grandpa is the head of a yakuza gang! Sachie tries to continue living her normal life, but she can't run far since Rakuto, one of the most popular guys in school, is part of her grandfather's gang and her new protector. Soon, Sachie finds herself falling for her bodyguard. But she's the granddaughter of Rakuto's boss, so he can never show his feelings for her. Can Sachie find a way to fit into her new family and seize her chance at romance?

Rakuto and Sachie finally bring themselves to openly acknowledge their feelings for each other and begin going through the awkward motions of redefining their relationship. But crisis looms as Rakuto decides to move to Kyoto to live with his ailing father. Will their new love be able to survive the separation?