An anime series I watch on direct tv VoD a couple years ago.?

Hello there! A couple of years ago I watch an anime series that direct tv was broadcasting on video on demand. N it's been nagging at me but for the life of me I cannot remember the name of the anime. What I remember from the anime is that, there's a boy who's weak yet he has a strong dormant magical power within him, something happen to him when he was little that put his life in jeopardy whenever he uses magic, so his sister hit him with some sort of magical forgetful mallet that erases his memory of using magic, so he doesn't even know that he have magic powers. Which baffles him when the president of his cl who wields a sword and a magical girl from another magic world are vying for his love to become his wife because his suppose to be the strongest man there is. Though the cl president sword wielding girl just wanna have his baby before he looses his strong magical power. That's mostly all I remember of the anime, so if u think you know what the anime is Please help me n share. Because it's been bugging my mind for a while now n it won't stop until I know the name of it. Please, pretty please, help me.