For Whose Sake (
Plot Summary[]
Following the events of the Mount Natagumo Arc, the group is now staying at the Butterfly Mansion. At night, Zenitsu takes Nezuko out on a walk to a nearby flower patch, and reminisces on the memories of his training. During one instance, he escaped his lesson and discovered a girl crying in the forest. Upon asking what's wrong, the girl named Sayuri reveals that she has been offered to a nearby Demon by her stepfather, as a sacrifice for her family's protection. Outraged, Zenitsu sets off to locate and defeat the Demon in order to protect Sayuri.
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Zenitsu discovers Sayuri crying in the forest.