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Shuuichi Hayasaka has been living a normal life until one day his roommate Masamune Yasuda wakes up as a girl. Although Hayasaka feels uncomfortable about now sharing a room with Yasuda as a girl, Yasuda is fine being a girl as long as he can sleep most of the time.
Tougo Ushiwaka reunites with his childhood friend and first love Ren Ryuugasaki after about 10 years. However, Ushiwaka had been traumatized to discover that Ryuugasaki, who he had thought was a girl, is actually a guy with a fondness for cross-dressing.
Teachers are entrusted with the sacred duty of guiding and protecting their students—but not undercover assassin Mr. Solo. In a world where magic users and non-users coexist, he walks a solitary path as the wizard hitman "Number Zero." His latest mission: pose as a magic instructor for the unruly, bottom-tier, second-year students of Class D. To complicate things, he's saddled with a new partner—a transfer student with the same deadly assignment. As they pursue dangerous student targets, unexpected twists arise in this exciting magic school fantasy!
A spin-off featuring Subaru and Asakura from Nanashi no Asterism.