Chika, a married woman, is caught shoplifting a 500-yen item at a convenience store—an incredibly minor offense, even by her own surprise. She never imagined this small act would drastically derail her life. Caught in the act and unable to deny it, the store employee exploits her helpless situation, acting purely on his desires. He threatens to expose the incident to her husband, adding blackmail to the coercion, and gradually forces her into a deeper, more intimate relationship. Summoning her again, the situation escalates into new, uncontrollable developments.