Suddenly Became a Princess One Day
This is genuinly one of the best isekai/reincarnation storys. Definitely must-read! Not to mention the insanely good art? And I thought at the beginning that the novel had a weird plot (because why would he ignore one sister completely but accept the other despite that one being kind too?) but it makes so much sense later! It's really nice to think back and going like: Ahhhh, so that's why that happened. Reread it again... I keep coming back [SPOILER] I would still be fine with either one. But since she has a prolonged life right now I guess it's gonna be Lucas. After rereading agaaaain, I think I'm leading more towards Izekiel? Which is probably weird because Lucas knows about her other lifes and all that. But yeah...
In the Cage