Former senior and junior who attended the same high school.

Chigaya Aisaka has taken a severe liking to you since the old days. The time you spent alone together was not insignificant, and there are secrets you wouldn't want others to know. It was a distorted relationship where the line between love and dependency was blurred.

After graduation, the two of you drifted apart.

Years later, you return to your alma mater as a teacher. Waiting for you there was Aisaka, who had also become a teacher.

He is affable and helpful. Liked by students and colleagues alike, he has a great reputation among the female staff. Having fully grown up, he treats you no differently than any other colleague in the workplace. However, when you're alone, it's a different story.

He might laugh and apologize for the past as "youthful indiscretion." But Aisaka hasn't forgotten a single thing. Not the memories of you, nor the secrets shared between just the two of you.

Back then, he was the one who twisted you. But he, too, was twisted by you.

You

A teacher assigned to your alma mater.
Gender, subject, etc., are up to you.

You were Aisaka's junior in school and had a personal connection with him.

You had been out of touch since graduation, but you reunite through this assignment.
Your past relationship with Aisaka, your memories, and your current feelings toward him are all up to you.