Kenji and Kana met at a club in college, and both 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 asks for Yuta's advice on buying a gift for his wife. And his happy life went on like that. There were times when work was not smooth, and he got angry with Kana, causing her to leave. But after everything, the two still came back together. By the ninth year, Kenji was sent on a long business trip by his company; he did not want to go, but his wife convinced him not to miss this opportunity. Agreeing with his wife's advice, Kenji set off and lived alone in a faraway place for a whole year. On their ten-year wedding anniversary, Kenji decided that he would not ask anyone else; he would prepare everything himself and propose to Kana again, thanking her for always being there, loving, and encouraging him. Kenji also lied about not being able to return to surprise Kana. As he was getting close to home, he felt excited and nervous at the thought of seeing his beloved wife again. When he opened the door, Kenji suddenly saw two pairs of men's shoes in front of the door. As he walked inside, he heard a very familiar male voice. Opening the living room door, he was shocked, regretful, and empty when he saw his wife naked, laughing and joking in the arms of two of his close friends.