Akutou Ikka no Manamusume, Tensei-saki mo Otome Game no Gokudou Reijou deshita. Saijoukyuu Rank no Akuyaku-sama, Sono Dekiai wa Fuyou desu!

Forget everything you picture when you hear the usual fantasy kingdom with swords and magic — your typical isekai reincarnation story setup. This one drops you into a mafia-run monarchy where the five most powerful crime families prop up the throne — and you're the daughter of one of them. Francesca Calvino has memories of her past life as the granddaughter of a yakuza boss, which you'd think would prepare her for this kind of thing. It doesn't. She knows she's living inside a mafia-themed otome game, and her main objective is simple: break off her engagement with Leonardo Aldini, the most dangerous man in the setting and the game's final antagonist. The problem is Leonardo has no intention of letting her go. Instead of the cold, threatening villain she expected, he's unnervingly devoted to her, which throws every escape plan sideways. The dynamic between them is where the show really lives — there's genuine tension mixed with dark humor as Francesca tries to navigate a criminal underworld she desperately wants out of, while the guy running it keeps pulling her closer. If you liked My Next Life as a Villainess for the reincarnated-into-a-game setup but wanted something with more edge, or if I'm the Villainess, So I'm Taming the Final Boss clicked for you because of the antagonist romance angle, this hits a similar nerve. The mafia setting gives the whole thing a different texture than your typical fantasy isekai, and the romantic tension has real stakes behind it.