Musume Ronshaku has lived a spoiled life. Shaming her dad to buy her stuff, bullied others, smoking outside of school, everything. Until the guidance consoler demands her and her gaggle of friends to befriend some students they have bullied since they were caught bullying other students or they would get expelled. While her friends were not doing what the guidance consoler asked them to do, Musume decided to not take risk and actually hang out with someone she bullied in the past. She then befriends Oka Ruto, the leader of the Occult Club and the strangest girl in school. While Musume and Oka's friendship grew stronger, Musume realizes that she has feelings for Oka, but she also finds out that Oka likes an upper classmate name Taro Yamada and plans to ask him out. Now Musume tries to find out a way to stop Oka from asking Taro out. Will Musume get Oka as her girlfriend? Will Oka ask Taro out? Will Musume get help from another student? Will Musume and Oka's relationship ruin Musume's reputation? Or will Oka get killed in this event? Musume Ronshaku, Oka Ruto and all related characters belong to Yandere Dev.