Miku, a childhood friend of Kyoko’s, confesses to her that she loves her. But Kyoko becomes concerned when she finds out that Miku has been having secret meetings with Nana, an upperclassman who is famous for liking girls, in the AV room during lunch breaks. One day, when she decides to follow them, Mizuki, the most popular girl in the school and her idol, suddenly appears in front of her…?