Yuri, a talented and beautiful office lady, had a boyfriend named Shigeki who lived with her. However, he was a man who lived like a parasite, not doing his job properly and spending every day playing pachinko. Yuri, who had a gentle personality, obediently listened to everything her boyfriend said. One Monday. When Yuri woke up, she felt discomfort in her lower abdomen. Thinking something was wrong, she pulled her nightwear aside and found, to her horror, that an ominous "chastity belt" had been fitted between her legs...