1.

Sugawara Koushi accepted an invitation to what he knew as a school which would guarantee success no matter the circumstance. He was accepted into the school for his talents with children, so he assumed the school couldn't possibly have anything that wasn't at least somewhat child appropriate. He certainly didn't expect to have to kill each other to 'graduate', he didn't expect to have to solve murders and he didn't sign up for being locked in the school with no way out.

Sugawara, however, feels like there's a mystery somewhere beneath it all.