I've stumbled across a few romance manga that dive into the yandere trope, and man, they can be wild rides. One that immediately comes to mind is 'Mirai Nikki'—though it's more thriller than pure romance, the yandere vibes from Yuno Gasai are legendary. She’s obsessed to the point of being terrifying, but there’s something weirdly compelling about her character. If you want something more focused on romance, 'Happy Sugar Life' is another intense one. It explores twisted love in a way that’s unsettling but hard to look away from.
For a slightly lighter take, 'Love Tyrant' mixes comedy with yandere antics. The main girl, Guri, is an angel who forces the protagonist into a love diary situation—where if he doesn’t kiss someone, he dies. It’s ridiculous but fun. If you’re into darker themes, 'Koharu no Hibi' is about a girl who stalks her crush relentlessly. It’s short but packs a punch. These stories aren’t for everyone, but if you enjoy chaotic, obsessive love interests, they’re worth checking out.