Extreme! Orgasm Training! Viewer

The heroine, who has been trapped in a secret laboratory by a mad scientist's trick, continues to endure the naughty cum training by the machine.​

20xx Japan. The government was powerless against the man-eating demons from the demon realm. They appeared out of nowhere. /What's more, they immediately recover from wounds inflicted by normal weaponry. With the country in panic, medical researcher Doctor Randai proposed a plan to defeat the demons, and the government approved it. Doctor Randai is a sketchy person known as a mad scientist, but his superior intellect is beyond compare. The bodies of young girls change when injected with demonic cells, and they harbor energy equivalent to that of the demons. The girls would then be put through specialized training to amplify that energy, and raise them to be "demon hunters." ...This was Doctor Randai's "Hunter Training Project."

Her name is Rin Yuuragi (18 years old. /156cm tall, 111cm bust, 55cm waist, 88cm hips). Her family was killed by demons when she was young, and she escaped despite also being attacked herself. The demonic cells that entered her body at that time have strengthened her, and also caused her to lactate. Having been selected as a candidate for the Hunter Training Project, Rin Yuuragi was confined to Doctor Randai's underground laboratory, and forced to undergo training to amplify her energy. The training method is...