At first i thought this was gonna be a waifu battle, the kind of manga that we'll be hard to decide who to be sided with?
But from the chaptr 1 the balance seem off, I always on the older sister side even when there is a lot of lovely dovy scene betwen the MC and the little sister.
At first i thought i will be some pyschological genre that we will be confuse by who is better. But even after read all of the back story each MC, still i cant be sided to the little sister.
This girl is sick. There is nothing good reason to support her.
If the author wants to make things better, he/she should bring balance between the two Female MC.
but that kind of story tends to have weak-minded Male MC.
Yeah in the end im still read it anyway.