Irainin ~Metamorphose~

Main character is an elite psychiatrist who works at a famous university hospital. He has a hobby of manipulating patients will with technique and special medicine and recording results on a video. One day he finds his psychiatrist grandfather research results. It's a study of how to manipulate humans freely, both personality, memory and athletic ability. Main character decides to inherit his grandfather's skill and make use of his hobby.

[From vndbreview]