Nagare Kano

Nagare is a slug yōkai who appears in chapter 7 of the first serialization. He has an obsessive crush on Kurumu, and threatened her to date him in exchange for taking pictures of her in embarrassing cosplay outfits, as she had promised to go on a date with him prior to the series' start. He even went as far as to steal the Newspaper Club's paper in order to make Kurumu do his bidding. However, he was incapacitated and defeated by Kurumu's newfound illusion powers. His powers as a slug yōkai allow him to slip through the slimmest crevasses and emit poisonous gases from his body that deprives the victim of their strength. He appeared in the Festival Arc, apparently having learned his lesson, but is turned back into his monster form with his inner desire released from the Lilith Mirror.