Oshiego wa Mahou Shoujo ~Chinami ni Ore wa Kyoushi de Kaijin~

Magical girls Akasaka Kanon and Aono Riri are celebrated heroes protecting the world from an evil organization bent on global domination. But when a charming new teacher arrives at their school, everything changes. Beloved by students for his kindness and engaging lessons, he harbors a dark secret—he is an elite monster sent to corrupt the magical girls. Using subtle manipulation in the classroom and sinister methods under the cover of darkness, he begins their transformation into corrupted versions of themselves, enslaved to pleasure and darkness.