Chapter 01 - "The Number One Boy in School": It's only one month until the graduation ceremony but Momose Gakuen is quiet. On February 14, Valentine's day, the most popular boy in school, Shinoda Kota, was poisoned by chocolates he received and died. While this incident has not been clarified, Nishina Tomoya, the assistant teacher of Shinoda's class, has personal interviews with the school idol group "Dust Kiss" that Shinoda was in while pressed by homeroom teacher Matsui.