Yuusei Iriake, a friendless, introverted high school student.

His high school had a school idol.

Her name was Sae Iyogi, an aloof beauty who rejected every confession.

One day, he accidentally witnesses her kidnapping and is taken along with her.

He wakes to find several thugs, Sae tied up, and herself about to be helplessly assaulted— well, you know the rest.

Yuusei subdues them all, saving the school idol.

His normal days should have returned, but... the unhinged girl now tries to stay by his side constantly?!

* Her yandere tendencies will gradually escalate.