Usotsuki na 5 Gatsu

May and Noriyuki grew up together and now attend the same highschool. Noriyuki has never told May how much he loves her and now that May has... filled out... all the boys keep confessing to her. But May will have none of that so she uses Noriyuki as a fake boyfriend. But in order for everyone to believe it, they will need to have some real boyfriend and girlfriends experiences together so their stories match. Just what does she have in mind?