Kenji and Kana met at a club in university, and they have decided to move towards marriage. Kenji also has two close friends from another school, Yuta and Takashi, who have helped him a lot. On each wedding anniversary, Kenji would ask Yuta for gift ideas for his wife. And his happy life went on like that. There were also times when work was tough, and he would lose his temper with Kana, causing her to leave. But after all, they would always come back to each other. In the ninth year, Kenji was sent on a business trip far away by the company, he didn't want to go but his wife persuaded him not to miss this opportunity. Agreeing with his wife's advice, Kenji set off and lived alone in a distant place for a year. On their tenth wedding anniversary, Kenji decided not to ask anyone else, he would prepare everything himself and propose to Kana once again, thanking her for always being there, loving and supporting him. Kenji also lied about not being able to come back to surprise Kana. As he approached home, he was excited, nervous, about to meet his beloved wife again. Opening the door, Kenji suddenly saw two pairs of men's shoes in front of the door, and heard the very familiar voice of a man inside. Opening the living room door, he was shocked, regretful, empty when he saw his wife naked, joking with two close friends...