Rōma and Tamaki are childhood friends who have a sexual relationship, even though they do not have feelings for each other. One day Tamaki proposes that they break up because Rōma refused to use contraception during sex. Yuri, a good friend, gets to know about the matter, and tries to mend their relationship, but she soon conceives feelings for Rōma which she tries to hide. She then confesses her feelings to him and they begin a sexual relationship...