Masato Rinno is a classmate of Doremi, Momoko and since Dokkan, of Hana. In 3rd and 4th grade, he was in the former class 1. He was the class representative of class 5-1 and 6-1. He also wanted to be the head boy, but lost against Tamaki Reika. Masato is the son of a doctor. He is smart but also arrogant. He matured later in the series.