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, Hokkaidou, Japan, though does not speak much of those days. She shows an interest for Yūto as she believes there must be a reason why they constantly bump into each other. She states that one of the reasons she chose Yūto's school to transfer to is because of a famous teacher, who graduated from the school and was known as the Performer of the Sunset, and who is teaching at the school.