Shiina is a girl who participated in the London Piano Contest with Haruka; Shiina ranked second before Haruka who ranked first. She transfers into Yūto's class at school. Her hobbies include playing the piano and the martial art of naginatajutsu. She always has a positive and cheerful personality and has a sociable personality which makes her transition as a transfer student very easy. She used to live in Otaru, Hokkaidō, Japan, though does not speak much of those days.