"Guu!" The sound of my stomach echoes in the classroom. The criminal, Kokoro, became embarrassed and secretly went to the corridor. Then, Suzunosuke Suzuki, the director of the "belly bell" that suddenly appeared, scouted "I have never heard" La "that is more beautiful than you!". "Haraberubu? La?" Apparently, the scale of the belly sound is different depending on the person, and it is said that the club activity that plays harmony with such a tone is the belly bell club. "If you get angry, youth is about to begin!" The heart that attracted me was to join the experience club. Every day I work hard with the members on various special trainings for the guerrilla concert. With the addition of childhood friend Kotaro Segawa (Toshiku Onishi), the power-up belly bell club will celebrate the long-awaited concert day.