At the age of five, Isaku's life was torn apart when her parents perished in a car accident. She was placed under the watchful eye of her yakuza boss grandfather, despite her reluctance to be linked to the clan. The repercussions of her family's ties left her isolated from her peers, but Isaku still hoped for a typical existence and the chance to find love. As she prepared to enter high school, she was met with an unforeseen obstacle - her faithful 26-year-old guardian, Keiya, who enrolled in the same school to ensure her safety. With a gun-wielding warrior at her side, Isaku must navigate the student lifestyle and evade danger. Can she handle this unexpected turn of events?