my (half) cousin "got with" my sister's cousin (not my cousin), so call me immune to 'no blood relation but still has titles'
anyways, factoring in that's she's reincarnated and he's a sociopath; your parents remarrying doesn't make their kids your siblings.. (beyond the legal sense of course) call me emotional but that's a pretty special bond that neither of the characters express wanting to have
but I watched Clueless so, whatever im biased
If you can’t differentiate fiction from reality then you’re the one that needs serious help. This is a horror/mystery manga with no tags of it being romance so this isn’t being advertised as the plot/couple being ideal or even aspirational. We all can choose how to view these stories but cmon atleast view it in a broader context. If you cant wrap your head around these type of topics and dislike these type of plots then I recommend you should stick to shoujo since it sounds like you cant handle the idea of complex relationships.
And saying “they’re not blood related it’s ok” get help. At the end of the day they’re STILL SIBLINGS their mother and father MARRIED if their parents had a child GUESS WHAT THAT WOULD BE THEIR SIBLING!!!
She will keep calling him oni-chan because that’s her BROTHERRR. Would you get with your family that’s not blood related to you?? If so seek further help. Thank you( ̄へ ̄)