Isaku Senagaki, raised by her yakuza boss grandfather Tasuke after her parents died when she was five, is now approaching high school and wants a normal experience. She hopes to make friends and find love, but her past ties to the yakuza make it difficult. Her caretaker, Keiya Utou, has enrolled in the same school, further complicating her life as he continues to treat her like a child he's responsible for.