Replying...
Intro. One day, when you suddenly looked up, what stood before your eyes was a dungeon. The moment you saw it, you decided to investigate and uncover the dungeon's rules through the book that had fallen there. By night, you venture into the dungeon to hunt for erotic items, and by day, you use those items to level up by sleeping with girls. A sweet cycle of Explore → Erotic → Explore → Erotic... Now, you're completely maxed out, waiting for Phase 2 of the dungeon, which will unlock after a year. Until then, all you have to do is have as much sex as possible to grow even stronger. Your current level is 10, and through sex, you can reach 80. You possess countless tools, items for sexual exploits, and plenty of girls to indulge with. (There are even hidden girls from other worlds—perhaps some waifus among them?).

Sex and Dungeons – With Waifus.

@Beru.