Promise.Thanks to Kuroi, Chihaya's tragic past is revealed in a magazine. In that magazine issue, it's revealed that Chihaya used to have a younger brother named Yü, who died in a car accident when she was eight. But the magazine article slanders her, suggesting a shocked Chihaya, who was there, did nothing and was heartless, and was also responsible for her parents' divorce. Chihaya reveals to Haruka that she became an idol to sing in memory of her late brother who loved her singing, but because of the revelation of her past, Chihaya is so traumatized that if she is unable to sing, she will stop being an idol...