Meniko Hamukai

As a student at National University of Kyokuritsu Manase, this cryptology enthusiast first bonded with Koyomi through their shared interest in decoding secrets. Unlike those surrounded by supernatural oddities, she leads a relatively normal life, though her rigid nature and difficulty adapting to sudden schedule changes often leave her idling during canceled lectures. Despite her slow learning pace, she maintains a deep, unexplained admiration for Koyomi, making her a standout figure within the series' university setting.