The younger sister of Takumi's best friend, as well as one of his childhood friends. She's had a crush on Takumi since childhood. She plays the cello that Ritsuko owned and takes singing lessons from Liese; she also has a part-time job at Ai's family cafe.
Karen Koshino
越野可憐
Owarinaki Natsu, Towa Naru Shirabe
