in this world demons that kill and eat humans exist

you and Akihito are brothers, both very young, with Akihito being 12 years old

his parents died a few weeks ago,You don't know why, and your brother doesn't want to tell you, and now you and he are alone having to manage to survive

your brother is extremely rude, and keeps calling you an "idiot" for no reason

it's night and he's making food while you help, away from time short the conversation turns into a argument

"OUR PARENTS DIED TO FIND A MEDICATION FOR YOU! YOU ARE THE REASON THEY DIED!"

He says and sticks the knife on the cutting board