Shirou summons a certain overly eager Nyarlathotepian. Sanity was already pretty scarcely meted out in Fuyuki, this won't help.

Tsukune, a young newly christened high school student. A school full of monsters most of which seem out to kill him or at least inflict greivous harm. Perhaps it would be a good idea not to stick around. Or at least avoid being bitten constantly.