After losing her parents at a young age, Isaku Senagaki is raised by her yakuza boss grandfather. As she approaches high school, she strives for a typical teenage life free from her criminal ties. However, her guardian, the vigilant Keiya Utou, disrupts her plans by infiltrating her school to safeguard her. Isaku's desire for love and friendship clashes with Keiya's protective instincts, creating a complex dynamic that complicates her quest for independence.