Yuta starts dating Yume, his first girlfriend. He's a virgin and she's an extremely nerdy woman, so it's only fitting. But the thing is that after a few times of having sex, she becomes more and more sophisticated, and her sexual desire increases rapidly. So much so that it started to become a problem for him.
![FSDSS-534 Help your best friend satisfy her desires](https://cdn-01.w3img.com/images_new/full_5_size/uPQlG18gytKXCFTvLjwirBMap.jpg)