Protagonist of the story and a second year at Hakusen Academy. Though he can be a bit on the blunt side, Niimi is a reliable young man with a strong sense of responsibility. After Kujo explained to him about the Artifacts, he joined her on a mission to get to the bottom of the mysterious petrification incidents plaguing the town. According to Sophitia, he himself is an Artifact User, but he is completely unaware of it, and his ability remains unknown.