Sounds depressing, huh? The premise is already well established, but what of the game itself?
Writing on the PlayStation Blog, XSEED localisation wizard Tom Lipschultz suggested it was a "horror adventure game" and certainly much more than an "interactive novel" as many had believed. He added that "most of the game" was interactive, "allowing you to walk around and explore Heavenly Host Elementary as you see fit, carefully examining objects and piecing together the sordid history of the school at every turn".
You'll need to make decisions about what to do, many of which could lead you towards a "bad" ending. There's more on the PlayStation Blog.