Kiriko lives with her husband's son. Thinking of his lonely mother, the son proposes that she accept him as a homestay student. The person who came to stay was Ike, a boxer who came to Japan to heal his wounded Kokoro and body after losing a match. One day, Kiriko saw Ike's practice and his huge penis, visible even through his pants, was burned into her mind, and she ended up having a Japanese Yobai!