After saving Koyomi and Suruga from the cram school, Yotsugi kicks Koyomi leaving a footprint on his face and convinces him to meet up with Izuko Gaen and take Suruga along. Despite a snail curse apparently affecting them, they finally manage to get to the meeting point, where they can't find Gaen but are reunited with Shinobu and find themselves facing a mysterious apparition.