Succumate game - It's another dreary day in the heat of the summer. After a long day at work, you return home to find that a succubus named Lilim has unexpectedly arrived to stay with you. For the rest of the month, she wants you to help her collect human energy from semen by meeting the quotas she has set for herself. There are reports of strange deaths in the area. In addition, it's not uncommon to find emaciated single men living alone in the city. Could Lilim be a part of this? What's the likelihood that something terrible will happen to you? To find out these answers, you must conduct your own research.