Seiji's sexual desire hasn't diminished even at the age of 70, and Seiji is sexually concerned about her granddaughter, Hana, who lives with her. Seiji, a former university professor, cites a specialized Western literature and emphasizes that sex is a wonderful act, but Hana just looks down embarrassedly. One day, Seiji discovers the sexual urge that the flower secretly holds, and sets a trap for the flower ...