Shifting of Plans SoP

Xenos Waters thought he was a normal seventeen-year-old boy, aside from the obvious things.

Namely, his parents being in jail, living in an orphanage, and, of course, the voices in his that occasionally make themselves known. But, other than that, he assumed his life was just as boring as the average person's.

That is, until one day he enters his high school and a horrendous creature is waiting for him and this other guy, Felix Zevitas, fulling intending to kidnap them both for some reason. This is probably when things started to majorly go downhill.

Since right after they escape this creature, a random man ambushes them and tells them that if they want to survive and control the magic they apparently have, they have to fight eighteen other people in a three-part battle to the death.

Seriously, what kind of bullshit is this?