ZETTAI MA KEN NO SO SEN BUKYOKU (DE ERISUTO) ANSATSU KIZOKU GA DOREI REIJO WO IKUSEI SHITARA, MAJUTSU GOROSHI NO KYUKYOKU MA KEN SHI NI SODATTESHIMATTA NDAGA
Author: Ichirou Sakaki
During the golden age of magic, Jin, a young aristocrat with a certain supernatural power, was known in the underworld as an assassin aristocrat who kills magic. One day, while carrying out his request, Jin meets the mysterious "slave lady" Lynette. After that, she and Jin infiltrate her prestigious girls' academy, and as the only male teacher, teach the young ladies their own secret swordsmanship!?