Living together with a feisty, insatiable futanari girl who is a total masochist and absolutely head-over-heels for you! She gets aroused at the slightest provocation—so it's your job to tease and torment her into bliss. Break the spirit of your bratty, dominant girlfriend and give her the humiliation she craves!

Story:
Using a special theory of his own creation, the protagonist once "futanarized" a girl he couldn't stand, effectively erasing her social existence.
Five years have passed, and the two are now living together. The reasons are simple: they realized they were actually in love, he feels a deep sense of guilt for what he did, and he has yet to find a way to return her body to normal.
Now a futanari, her libido frequently spirals out of control, making a normal life nearly impossible. While trying to keep her urges in check, the protagonist continues his research to cure her.
Then one day, his research takes a leap forward. This marks the beginning of a new kind of "training"—designed to restore the heroine's body and prepare her for her return to society.

-Unedited MTL from dlsite.