One day, Shinji lost the key to his house and couldn't get inside. He was helped by Yuiko, a widow living next door, who let him stay in her room until his parents returned home. Living alone, Yuiko was bright and kind, making Shinji's heart race. However, one night, he found a used condom wedged in the sofa. Caught at the scene, Yuiko confessed that there were times when she couldn't help herself since her husband was gone, desperately pleading with Shinji to keep it a secret. Her passionate demeanor stirred intense desire within him. Shinji promised to keep her secret on the condition that he could play with her body. A new relationship began to bloom between them.