The protagonist, living a reclusive life, fell for Natsuko Oominato, the girl working at the local convenience store. Though he wanted to get closer to her, he was content just to watch from afar. However, his peaceful days have come to an end when Natsuko suddenly got a boyfriend. And it didn’t stop there—he found out the guy was quite the player. To make matters worse, this jerk was growing tired of Natsuko and even nudging his friends to pursue her. Feeling the pressure, the protagonist decided to ambush Natsuko after her shift and desperately tried to convince her to break up with the guy. But Natsuko just freaked out and ignored him completely. In a moment of desperation, he lost his grip on reality and impulsively dragged her into his room. "What am I doing... but if I let her go now, that guy will..." “Right... if she’s going to get messed up by that loser anyway, then it’s better I do it instead!..” And so began their bizarre “breeding co-living”—