He discovered that he had transmigrated.
Even worse, because he had previously selected "No men, no play," everyone in this world had become female, including the blond guy.
Worst of all, the game had just turned into a side game! He would have to face countless ravenous NPC ladies and vicious heroines while knowing nothing about the plot!
Fortunately, he inherited the game's skills and cute looks!
All he had to do was keep pretending to be a girl, get through the main story safely, and then
Rich girl at the school gate: If you can't pay me back, you know what that means, right?
Teaching assistant in class: I'd like you to answer this question by yourself. If you can't, then we'll discuss the pet between your legs under that skirt!
Librarian: These books are sentient, and if any go missing, they need to be replaced with something even more sentient! I happen to know about a room beneath the library. Come with me. I've got anesthetic and a knife ready.
Unknown girl: For you! I broke up with my girlfriend. You're all I have now!
He was stunned: Wait! What's going on with that last one?!
A certain white-haired girl popped out of the System: You're playing the blond guy too!
Unknown girl: You're not going to abandon me too, are you? Then I'll have no choice but to
Him: Wait! Why did she go yandere?!
Certain white-haired girl: Getting stabbed with a kitchen knife is one of the blond guy's possible endings, too!
Him: Damn it!
Basically, it's about someone who, to escape a side game full of girls, has no choice but to put on a skirt, yet ultimately can't escape their clutches!