M.E.M.: Yogosareta Junketsu

Protagonist train girls into sex slaves for the rich, The girls are trained through experiments. Both end up horribly wrong in the end, but M.E.M. is A LOT MORE tame compared to Bondage Game. As a personal warning, Bondage game might possibly give you future trauma, because of all abnormal experiments given. Protagonist in it doesn't give a shit about the mentality of the girls. M.E.M relies on experimenting sexual pleasure on a positive note. They don't do any harm that crosses the line, and stays in the realm of sexual pleasure.