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Yuuto goes missing during the class fieldtrip, and a familiar pair of demons are behind his disappearance. Then, the crew learns there's trouble brewing when demons are being devoured by something or someone sinister.
Himari takes time to recover after the battle with Kuesu. But her secret remedy has her acting quite catty! Not wanting Himari to be harmed again, Yuuto decides to take the matter into his own hands and confronts Kuesu.
Facing three great demons is a lot to ask of for an untrained Demon Slayer, but as demons crucial to the land are being devoured, it's time for Yuuto to step up. But can he face them without being able to use his power?