After a night of fierce combat against the avatars of the upper moon Hantengu, the slayers are galvanized by the imminent dawn. Tanjiro, who has located the original body, gathers his last strength to catch up and defeat it before it manages to take refuge in the shadows. But if the sun's rays are the allies of the slayers, they are deadly for Nezuko. Tanjiro hesitates: should he abandon his chase to protect his sister, or should he sacrifice her to defeat the upper moon? Will Tanjiro succeed in decapitating Hantengu?! What will happen to Nezuko?