Maruyama, Takako

丸山誉子

She appears as one of the participants at the preliminaries of a regional piano competition, where she became angry at Amamiya and was crying. Kai cheered her up and gave her inspiration for the future. Consequently, she found her own style of playing.
She calls Kai "Wendy" because his hair color resembles that of a pet dog. Her favorite place is the restroom, where she is usually sitting with her dog, Wendy.
She has four successful siblings. She was trying to impress them and her parents with her playing, and eventually, she did.