[Hunter] My Beloved Older Brother

My family treats me like a machine for arranging marriages,

while the servants treat me like a demon:

My power once caused the deaths of 67 people,

but I used that power on myself, just to return to the past.

I am Darkness, from another world.

No transmigration, no Mary Sue. The protagonist is Aruka Zoldyck, with Killua as the pairing. A sibling story (sister? brother?).

If you've read it, please leave comments and share your thoughts.