Rin returns to her husband's hometown in midsummer. However, her father-in-law is hospitalized, and her husband is too busy with her work to talk to her. At that time, she met her neighbor Sakamoto, and when she went for a walk to his house, she... Rin, who was interested in her naive reaction, uncovered her sweaty chest... Her virgin Sakamoto can't bear it and pushes her down. What she meant as a joke turned into a serious joke.