Kana is usually easy to believe what people say and is easily influenced. One day, she is saved from a scam by her brother-in-law Taichi. He is a deep-sea fisherman who has been starved of women for a long time. He sees through her secret desires and skillfully wooes her. Kana is overcome by his momentum and is swayed by the words, "If it's just once..." She is unable to resist and is violated again and again, and her body becomes more and more sensitive. Before she knows it, she is overcome by the immoral pleasure that runs through her entire body, something she could never experience with her indifferent husband.