3 Nen B Gumi Ne Kuro Man Sir Sensei (GA Bunko) [Light Novel]

[Machine Translation] I will make you apostles of the extinction of mankind! Dark mage Cthu falls into darkness for a certain reason and takes a teaching position at a school for demons in order to destroy the human race. However, the class he is in charge of is full of kind-hearted low class demons who yearn for human culture. Coutu tries to correct them with his wild lessons and sad stories of his own experiences, but in the end, his students' talents begin to grow! Meanwhile, the spirit mage Gardina invades the school with an army. Her goal is to purge Coutu, who betrayed the heroic PT. This is the record of a legendary teacher who was praised in later generations as "the one who controls the darkness.

「お前らを人類廃滅の使徒にする!」暗黒式魔導師クトゥーは、ある理由から闇落ちし、人類を滅ぼさんと、魔族が通う学園で教鞭をとることに。しかし、担当クラスは人類文化に憧れる、心優しい低級魔族ばかり。クトゥーは破天荒な授業や、切ない実体験を語り矯正しようとするが、逆に生徒の才能を伸ばしてゆく!?そんな中、精霊魔導師ガルディナが軍隊を率いて学園に侵攻してくる。狙いは勇者PTを裏切ったクトゥーの粛清。そのとき生徒たちは―これは、後世『闇統べる者』と讃えられし伝説の教師の記録である。