Wakamura Sachie is a recently orphaned 15 year old high school student whose mother had just passed on. Her mother’s demise leaves her with no roof over her head and no kin to rely on. To her bewilderment, an old man, Asagi Raizou, turned up on the last day of her mother’s funeral claiming to be her grandfather. With no other alternative, Sachie follows him home warily.
As Sachie entered the walkway of her new home, she was shocked to see rows of men bowing towards her grandfather and her. Only then did she realise the true background of her family, a yakuza family. Due to their almost similar age, Sachie was assigned under the care of Igarashi Rakuto, a handsome lad who seemed to understand Sachie better than she knows herself.
A different and all new chapter of her life awaits Sachie from her arrival into her yakuza-like family. Just what stories and adventures will she create with her mysterious grandfather and the charming Rakuto?