A bittersweet love story with my first love—my beloved sister. The protagonist, Yuta, is secretly in love with his stepsister Mizuki, a popular girl who draws attention at school. One day, Mizuki gets bullied by two delinquent classmates and asks Yuta if she can follow him home. Innocent yet radiating an irresistible charm, Mizuki's allure completely captivates Yuta's heart. This film portrays his deep feelings and their pure romance.