I was the one who fell for her first, but my junior from university was assigned to the night shift and overnight became the manager's personal sex toy. (Futaba Megumi MKON-144)

Ema and Aizawa, who work at a convenience store, have their shifts scheduled together four days a week. They get along well and seem to have feelings for each other. One day, a night shift employee has a fever and takes the day off, so the store manager asks Ema to cover for him. Aizawa volunteers, saying, "Ms. Ema is still a student; we can't let her work the night shift. I'll cover for her," but because Aizawa has an early shift after the night shift, the manager refuses, and Ema ends up covering for him. Ema complains to Aizawa, "The manager is disgusting; I really hate him," but Aizawa can't do anything about it and can only leave them both home. Later, Ema loses her virginity in the convenience store's back warehouse, becoming the manager's sex slave overnight.