Taikai Shibuya (Taiga Kyomoto) is a popular young actor with excellent acting skills and a charming smile. Women are crazy about him, but Taikai Shibuya has never been in love in his life. He has a 4-year-old sister named Rizumu who attends nursery school. One day, Rizumu comes back home with a scratch from the nursery school. Taikai Shibuya is concerned enough that he passes up on a drama series acting offer and decides to take Rizumu to school and pick her up after school. At his sister's school, Taikai Shibuya meets Rizumu's teacher Aika Aota (Momoko Tanabe). He gets attracted to her. Meanwhile, Aika Aota is a devoted nursery school teacher who likes children. She has a warm heart and cares about other people.