A brief description of the manga My Fiancé is in Love with My Little Sister:
Oh, again?
My fiance was staring at my adorable little sister. When I saw the flame in those cold eyes, deja vu attacked me.
My fiance fell in love with my little sister, back in my past life. There was nothing I could do about it but watch.
For some reason, I am the one who constantly returns to this very moment.
Update for those seeking misery! The latest chapters have left off on an optimistic note, which is confusing and even somewhat concerning. Something is definitely going to go wrong.
I came here because of the title and left because of the title
If u think this is good or u wanted to read because of the title u need help
Haa.. this is purely a truly suffering 
Based on the title. Reading a single chapter feels like a sin.
What goes on these writers minds open cuckolding became a genre damn
god this manga is depressing, and it all seems kinda dazed as another person said, and very confusing. plus, it never seems to progress. however, it is pretty good despite that, so give it a read if you have time and have the mental stability
That title is disgsuting🤮
This is messed up. The mid chapters that were released, that seemed to follow the guys perspective, raised more questions than answers. The series feels very wishy washy with what is happening and everything feels like its in a daze. The main character is just completely broken mentally and has no concept of happiness so she clings on to what she thinks is love. If it weren’t for the mid chapters I would think the guy was the antagonist, but now it seems the sister might be if unintentionally. I don’t see this series giving any answers anytime soon, so the theory Im sticking with is that they are in Hell. Since the one she loves will never love her back but will be stolen by the one everyone loves, and the guy forever see’s the one he loves slowly become disillusioned with him and him not having any control to stop it and not even consciously realizing it.
Yadda yadda
I read a bunch of spoilers from someone who read the novel after reading these 18 chapters of idiocy. TLDR of the 18 chapters is: mc is a pushover and suffers, the end. The art is good but the story is dumb and if it follows the novel it might get worse.
if you’ve read the current chapters, here’s a spoiler from Reddit to put you out of your misery
Another story of a victim, which would have been fine, except for that little thingy of the time loop, why in the hell would someone choose to torment themselves with that kind of shitty people?
Wow that title
Honest thought I’ve read till Chapter 24
This manga has some of the worst world-building I’ve seen. I hope we see more from it, as we have only seen small chunks of the world. We have seen more of the mansion the Mc lives in but nothing More… it makes me wonder if the so-called kingdom is even one, but if I had to rate this series, it would probably be a 3.3/5 because the Mc alone is so infuriating beyond belief. The plot isn’t bad, but it’s filled with cliches. I only rated it so high because of the art/artist. They have done an incredible job so far… it was a semi-good Tragedy story but everything else just felt Cliche the Mc is the main reason why I’m quitting the manga
Rating: 3.3/5