Маруяма Такако

She appears as one of the participants at the preliminaries to regional piano concours, who got angry about Amamiya and was crying. Kai cheered her up and gave her inspiration for the future. So, she found her own style of playing. She calls Kai "Wendy" because he has hair color like pet dog. Her favorite place is the restroom, where she is usually sitting with her dog, Wendy. She has four successfull siblings. She was trying to impress them and her parents by her play, and finally she did it.