"Everyone has a secret." Takumi, a high school student curious about people’s hidden sides, teams up with his homeroom teacher, Ms. Umi, to create the "Secret Club", a group dedicated to solving students’ private troubles. However, a difficult and cryptic request comes from his classmate Sora! And what is Takumi’s true reason for founding the Secret Club…? With countless mysterious requests pouring in—can the Secret Club truly solve them all!?