Himari and Yuzuru live next door to each other and, due to their respective family circumstances, have spent their days like brother and sister. Yuzuru likes Himari as a woman but has never been able to confess his feelings. Then, one day, Himari finally decides to get married. If he misses this chance, he'll never be able to express his feelings to her. Thinking this, Yuzuru decides to confess his feelings to Himari, but is rejected. A little while later, Himari comes to Yuzuru, who is feeling down, and asks, "Do you want to have sex?"