(OVA 1: A Boy's Toy) 
Shinta Murakoshi just scored the best toy a guy could ever ask for: a hypnotic gun. Armed with the power to make anyone do anything at any time, he sets off to fulfill his fantasies and turn every woman he meets into his secret personal love slave! 
(OVA 2: Love Trance) 
Shinta continues to add to his hypnotic harem, but when his latest target, the sexy Midori, comes on to him, he's not sure what to do. Does she actually have the hots for him or is it some sort of trick?

Susumu is negative and introverted. He is just living a vacant life, always been reprimanded by his mother and never resisting it. All that changed the day he met a certain person that just moved to the Condo he and his mother live in, that would bring a dramatic change in his life...he is been taught hypnotism!! 
Susumu will use his new godly technique on his mother but first he will use it on his next door neighbors: that hot big busted Mother and her cute daughter... 
(Source: AniDB)

Murakoshi Shinta seems to be just a doctor at school. But secretly he has taken advantage of his position to hypnotize every female student he likes. Now, after putting all the targets under his control, he begins to transform the poor girl into his sex slave ... 
 
(Source: Translated from Nekopoi)

Shinta Murakoshi is an extraordinary student. Every student hates him and both teachers and parents hate him. His life is in despair... one day, he receives a gift from his internet friend Mr.K. It is a hypnotic machine...
(Source: ErogeShop)