After losing her husband three years ago, Maki, a mother-in-law who now lives with her daughter's family, has gradually become less lonely. One day, she accidentally discovers that her son-in-law, Tsuyoshi, has a huge penis... For a long time, Maki had not been with a man, and she became excited by his penis and began to seduce him using her ripe body whenever she had the chance. Tsuyoshi, who had been sexless with his wife, could not suppress his excitement in the face of her proactive sex appeal, and finally thrust his huge penis deep into Maki's vagina...
