A large monster attacks Japan, but dies suddenly. While the people rejoice and bask in relief, the giant corpse left behind begins to slowly rot and bloat. If it explodes, the nation will be destroyed.
Story of the struggling chorus group "Yamada Osamu and the Hello Nights", who gain an unexpected new member in the young Ai, who pursues her dream of becoming a singer.
Ryota Takeshima (Masataka Kubota) has followed in his father's footsteps and now works as a prison officer at Kitakanto Prison. He has witnessed corrupt prison officers who tolerates bullying and gambling. Soichi Nakui (Yukiyoshi Ozawa) then becomes the newly appointed prison chief. Soichi gives an order to Ryota, informing him that he will get rid of prison corruption.
