I just read this manga when this chapter was released. And maybe this is my opinion so far. (I didn't read thoroughly, it was too painful to see Illya's suffering)
I don't think this story would be appropriate if it had a happy ending. Indeed, Illya needs a happy ending. But my personal opinion is that whatever happy ending Illya receives, it will not improve the suffering she has experienced. He had died many times, been betrayed, abandoned by the people he loved most. Even though I know this story will definitely have a happy ending for Illya. But I won't be happy if illya doesn't get justice. It wouldn't be fair if her sister Sylvia just ended up listening to her sister's suffering and ended up apologizing. It would be unfair if Soleil's fiancé only apologized for the suffering Illya had experienced because of him. Even though I know Sylvia wasn't wrong and I know Soleil was affected by something (based on Ch. 13.5) but it doesn't feel fair to take everything that happened as normal. Even if Sylvia and Soleil felt the same as Illya's suffering, it still wouldn't be fair.
But I also know from Illya's character that she will easily forgive everything that happened. Looking at the development of the story will show that all this time her sister was poisoned by his mother. And all this time it turns out that Soleil has been influenced by something. Even though clues have been issued, it feels like the end of this story is still quite far away. Honestly reading this wasn't fun. It feels like riding a roller coaster where the track only drops 90 degrees down. This is also the first time I really felt the desire and need to write my opinion on a manga.
Thanks for the translation. I will still continue reading this, even though I know there is no hope of getting a chapter that gives Illya happiness. And even though I know that no matter how good the ending is, it won't taste sweet when compared to Illya's suffering. Thank you for reading my opinion, sorry I wasted your time with my opinion...
Edit: To be honest, I was muttering about my feelings about this manga story for 20 minutes. Writing this opinion really removes the burden that has been stuck in my mind. Maybe in the future I need to often write my opinions about manga that I like or not.