Reko, who happened to pass the idol trainee audition a year ago, was practicing as usual. She often played instruments and used the large practice room alone. One day, the smartphone she left in a basket rang. It was a call from her manager. Reko answered and asked what was up, only to be told that a new trainee was heading to her practice room. After the call ended, Reko sat down to rest, wondering who it could be. The door opened, and a girl who looked like a college student peered around. Reko looked at her and fell in love at first sight. The girl approached, introduced herself as Nao Egokoro with a smile, and Reko's face turned red at the sight of that smile. Since then, Reko has been practicing with Nao, stealing glances and trying to find the right moment to talk to her.