The yandere beginning is new I just wish it impacted the story more as all it does is bring a different causer of reincarnation. Dude never brings her up again from what I have read which is sad as I like to learn about the MC's past experiences.
Another onii-chan foreshadow. She says "If my Onii-chan is still alive..." I refuse to believe that that was just a grammatical error! THE PIECES SHALL COME TOGETHER.
I swear there is some secret behind all those Onii-chan references. Or it is really just worship. Personally, though I feel that her dead onii-chan is an important plot point.