As the only child of the Kumicho in charge of the Tsuzuki Group, Hikari Tsuzuki has harbored unrequited love for Akito Fuwa, the second-in-command or Waka-gashira of the same organization, for six years. This year, she vows to confess her feelings and embark on a romance that defies the societal barriers of hierarchy and age between the tough, tsundere yakuza boss's daughter and the reliable, composed Waka-gashira.