Mahouka koukou no rettousei for harem First Chapter

Shiba Tatsuya gained a great deal of magic through the experience of his mother, but this power came at the price that he can not use any other magic because his body is full of magical power that does not allow the rest of the magical powers and as a result of all his emotions the only passion left to him is his sister Shiba Miyuki But what would happen if he tasted the forbidden fruit while protecting his sister in FIRST HIGH SCHOOL, full of beautiful women around him, followed our hero during his conquering of women and teachers during his mission.