Houtarou and his friends successfully fought together and repulsed Saigetsu. However, Kaguya now starts attacking Houtarou. It's too much for a fight! What is the reason...? Meanwhile, Hundred is also preparing for a final attack. The "Doomsday Clock" has begun to tick... What actions will Houtarou and Kaguya take in the face of its immeasurable power?
