Haruta is handsome and smart, Chika is bright and naive. When they were children, they were friends until Haruta's family moved away while he was in the 3rd grade. They meet again during a high school entrance ceremony. After all of these years, Chika is eager to join the wind instrument club. Due to an incident, the wind instrument club is about to be disbanded. Chika can't give up the flute so she attracts Haruta to her side and tries to recruit members from the wind instrument club. The group attempts to solve various cases taking place at their school while they plan to take part in a contest.
| Actor | Role |
|---|---|
 Shori SatoHaruta Kamijou | Haruta Kamijou |
 Kanna HashimotoChika Homura | Chika Homura |
 Yuri TsunematsuNaoko Serizawa | Naoko Serizawa |
 Hiroya ShimizuKaiyu Hiyama | Kaiyu Hiyama |
 Koki MaedaKeisuke Katagiri | Keisuke Katagiri |
 Takuma HiraokaKyoji Miyamoto | Kyoji Miyamoto |
 Moka KamishiraishiTaeko Yonezawa | Taeko Yonezawa |
| HHimeru NikaidôWakaba Noguchi | Wakaba Noguchi |
 Kotaro ShigaToshio Iwai | Toshio Iwai |
 Keisuke KoideShinjiro Kusakabe | Shinjiro Kusakabe |
 Sei ShiraishiNot listed | Not listed |
 Emina KondoNatsumi Maebashi | Natsumi Maebashi |