Why??? It's a good ending
it might be bc they felt bittersweet from Remilia and Angel since Remilia doesn't have feeling for him but Angel do however he only saw Emi's version
The way they executed it in the manga is way better than the novel though, here Remilia actually felt love for Angel because he saw Emi's version of her which she loved dearly. In a twisted way we can also interpret it as her falling for him bc let's be honest she's not a normal person, that's probably the closest we'll get to genuine love for her.
ohh i see, I didn't read the novel one but i think i kinda understand it
The end is kind of disappointed