
I can't like the seme at all. "That woman" is not a respectful way to call one's sister I feel like. Daichi is cute and all wanting to get the money back but gosh won't you stand up for your sis more ... but then it didn't bother him that much to sleep with his sister's boyfriend...
Maybe I don't like both of them...
Sorry I'm just triggered imagining as an older sis

Yeah well, I never said she deserved it. Just said that I thought she wasn’t an amazing or the nicest sister from the looks of it. It’s just that I’ve seen a couple points of her personality that irritates me or how she acted.
Like being lazy/a slob etc. and telling her bro to make her food just cause she doesn’t wanna do it herself. That one small scene where she pushed the bro away from the dad. How the bro mentioned that she was good at acting innocent in front of their guardians. That small scene where the seme showed how the girls that date him only wanna show off to other chicks that she got a fine man (looked like the sis had that look on her face too).
I don’t particularly like the uke/mc either as he’s pretty weak ngl. And the seme as well. But if it comes to just personality, it’s the sister that I dislike the most as I’ve seen such annoying characters like that before. The other two personalities, I’m used to seeing and not that bothered by it as I already expected it from the both of them at the very beginning.

All of those things are minor, and there's not enough development from the Sister to determine why she did any of those things. We just see the uke's onesided understanding, and from what I can tell, he has a skewed view of how he fits into his family. The flashbacks with her pushing the uke, she's a child and there could be a number of reasons as to why she did that. It's also not like he has to make her food. My siblings and I make lazy demands of each other all the time, he could just say no. We also don't know if she was like the other women when dating the seme. If anything to me, it seemed more like a self esteem thing, because she cleaned herself up and thought someone actually liked her, not so much like she was better than other women.
This is all subjective though, and a part of me seriously doubts there will be any any real development in the siblings' relationship at all that would clear up some of the uke's feelings about his family, or a clearer view of how they lived as kids, OR any more development for the sister. ╮( ̄▽ ̄)╭

I don’t like any of the characters. I just wanted to say my opinion that out of all of the characters, I personally dislike the sister the most. She carries personality traits and actions that I’ve seen before in all annoying characters that I’ve hated. I’m not comparing their sibling relationship to reality or my own experience so i don’t really care if that’s what’s considered normal in real life for most people or for you ╮( ̄▽ ̄)╭
I’m not defending what the brother or the seme did- I know both did wrong things. I just wanted to point out my take on little things that others may not have noticed in a minor character. Rather than point out the very obvious faults in the two main characters

I feel the sadness coming, but the previous two couples had a good ending so I have hope for this last one.

I saw that a lot of people consider those endings as sad, and I agree but in the end those are still good, the first demon's still waiting for the reincarnation and I agree that's fricking sad but they're gonna meet again and the second one used his power to bring the guy back to life so nothing sad here

I saw that coming and that's what I thought when the guy was brought back, but the reaction he had didn't make him look desparate to be back alive moreover the demon got that pseudo punishment making him honest so ... they're getting a chance to have a better relation I think. To me it looked like the author made this ending quite positive.
As to what the future holds, you're right, being forced alive for a long time is sad, but they could manage that life or not, we don't know.
The fact is their last chapter ends with them being lovey-dovey and the guy acting kinda tsundere so I'll take that to say "nothing sad", but I know the possibility of them being unhappy exist :)

Is this Yuki's bizarre adventure ? I'm sick of him

I'm leaving when I'll lose interest, not the case at the moment but the point I mentionned could make me leave when I'll decide. I can make decisions for myself so I don't need your advice (or order idk).
Oh and I get the story you know, but it doesn't mean I like how the author is doing it in every chapter and in every page... I thought that was obvious, my bad
Also for you it's about his passing for me this a story about getting over his passing, I get we have to know the past to grasp the present but to me the past (Yuki) often overtakes the present, I feel he's more present than Uenoyama which I don't like (excuse me once again for not liking something)
But then the need to get over his passing is an effect his passing, oh ... it's just we have different take on this story... doesn't seems normal to you, but sorry that's called subjectivity.
The uke : you're my dog but it's okay to sleep with you cause I want it and you just happened to turn human
Also : you're my dog so we can't be in love even if you just turned human
I get there's a difference between having a human body and being a human, but the uke is so selfish and didn't do any effort to look after Jonggu's transition to human, for him he's a human when he needs but still a dog when it's better for him...