Nia, who made a promise to marry Toudou when she was in elementary school, is still single-mindedly in love with him even now, 12 years later, as an art university student. Not wanting anyone else to take Toudou, who has been hinting at his desire to get married, she confesses her feelings once again, but he dodges her by using their age difference as an excuse... Will the day ever come when Nia's feelings finally reach Toudou!