I still hate the MC for leaving his sister behind. And even after a few updates later, I still hate it. I hope the MC dies again and this manga to be axed...
EDIT: read some of the comments before me, guess a lot of us are also pissed at how acted with his sister, and most of us dropped after that part too...
seriously, that scene needs to get a fix, don't care if she's yandere or not, relationship matters, MC just being irresponsible and just ran off like an Ahole...