After the death of her father, little Isaka Senagaki was taken in by her mother and grandfather, a third-generation leader of a yakuza clan. Over time, the girl considered the clan members as her own family. However, as she grew older, she felt burdened by the lack of friends her age. But her status as the yakuza leader's granddaughter prevented her from trusting anyone. In her senior years, Isaka decided it was time for a change. She planned to hide her position, join a club, date a young man, and finally experience what it means to have friends her own age...