The legendary stone "Platonic Heart" is said to grant any wish to those who hold it. Behind it, which is told as an urban legend of uncertain truth, there was a secret battle between "warriors" over the heart. Aya Iseshima, a high school girl who attends Seijun Jogakuin, gets caught up in a dangerous competition by chance, and ends up fighting alongside her best friend Natsume... This work has attracted a lot of attention as it has been developed into a pachislot machine at halls nationwide. Beautiful painter Jin Happoubi worked on the original character design, and Junji Kurakami breathed life into the series of beautiful girl battles.