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Shioriho and Ichiro have been dating since their school days. They got married two years ago, and their relationship remained as friendly as ever, but this summer, Ichiro's affair was discovered. Having a child did not go well, and Shiori fell into the depths of despair. At that time, Ichiro's father, Tooru, decided to stay at his house while on a business trip to Tokyo. Shiori reunites with her father-in-law, who has been kind to him ever since she lived in her hometown, and is drawn to him. When Shiori realizes that she has been subtly seducing Tooru, she makes up her mind and heads to Tooru's house...