In Kakegurui, with Super S-Rank Charm

Hyakkaou Private Academy is a brutal school where social standing is determined by money and gambling skill. A girl who was tricked by her classmates into losing a huge sum of money and was about to become a house pet gains the Crazy Gambling System. Win or lose, she earns experience points and can draw cards to acquire special abilities.

System: Congratulations, Host! You've drawn the special ability card "Charm." For five minutes after use, all nearby women will find you overwhelmingly attractive!

How is that ability supposed to help with gambling???

And yet her ultimate mission is to conquer the female characters. This is the story of a girl struggling to survive at an academy full of perverted women.

(This is actually a romance story. The gambling is just a bit of variety, and all the gambling games are only there to serve the plot. In real life, everyone should stay away from gambling for the sake of your health.)