Kougami Aoi's class includes Ruzaki Mizuki, a graceful beauty who excels academically and is an all-around athlete.

She was trusted by friends and teachers alike, always surrounded by people.

Whenever anyone asked for her help, she would cheerfully accept with a smile and flawlessly carry it out.

Kind, with an angelic smile, she seemed to possess no discernible flaws.

Despite all this, Aoi wasn't particularly fond of her.

However, a certain incident leads Aoi to discover Mizuki's true self, and she begins to fall for her.

Aoi has no recollection of doing anything that would make Mizuki grow so fond of her.

Yet, from a certain day, Mizuki begins to sweetly seek her affection and rely on her.

An enigmatic bond known only to Aoi and Mizuki.