第1話: 和也とクラスメイトが下着失踪事件とアマソギの活動を探る部を結成

Kazuya Kagami has a dream about a mysterious Amasogi. In order to deal with the Amasogi at school, Kazuya and Kiriha Obina make a club with class' 2-2 classmates (Shirou Shiramine, Osamu Osanai, and Chisato Chikaishi). They investigate the cause of girls' underwear gone missing at school. Another group of students is involved in activities with an Amasogi.

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