Maiko Eguchi, a high school girl who loves adult games, has feelings for her childhood friend, the perfect prince, Sho Oji, who excels at everything. One day, Ma-ko receives a summons from Sho-chan to meet behind the school building!

Excited with anticipation, Ma-ko's heart swells, but between her and Sho-chan, flags start popping up one after another, just like in an adult game!