Holy Armored Princess Elementia ~Hypnotic Brainwashing of Disgrace~

The main point of the game is the corruption of the heroine and the ntr parts aren't really that heavy but it has a bit of everything. There aren't any choices but at least the plot isn't some overly dramatic bad ending like Fuyua's and Sayaka's games.
Description: There exists, a syndicate of darkness by the name "EVIL". Performing piracy, slavery, and all manners of crime throughout the galaxy... Using advanced technological prowess they invade undeveloped planets and their next target for pillaging is an energy source existing on Earth. "ELEMENT" Our heroine, Nozomi Kisaragi, is a warrior of justice named "Element Venus"! To protect earth, with the support of her lover, "Element Knight" she fights day in, day out against the dark forces of the EVIL syndicate In charge of the EVIL earth invasion force is Genom. His plan is to use the powers of "ELEMENT" for his own gain but... Element Venus keeps getting in his way. ... and with complaints about his lack of progress from his superiors, Genom has had enough of this fiasco! Be careful Element Venus! He will use whatever dastardly tactics it takes to capture her and... Here begins his heinous hypnotic brainwashing operation. From warrior of justice, she will fall, into the dark depths of pleasure corruption!