After her husband passed away, Maiko lived with her daughter and son-in-law. They had been living a peaceful life without wanting for anything, but after becoming a widow, she had been feeling a longing for her body. Her son-in-law, sensing the seductive charm and strong pheromones emanating from his mother-in-law Maiko's voluptuous body, witnesses Maiko masturbating and immediately forces himself on her. Maiko, unable to hide her desires, eventually finds herself unable to strongly resist, and the two of them end up drowning in an forbidden relationship...