Saint Marie (manhwa)

Saint Marie (세인트 마리, "Seinteu Mari") is a manhwa series created by Yang Yuh-jin. It is about a fictional private school, Saint Marie, that becomes a battleground between good and evil.
Story.
Dah-In Hyun, a normal everyday schoolgirl, discovers that she and the other students at Saint Marie have become pawns in a proverbial chess game. When her best friend dies trying to defend herself, Dah-In finds herself trapped in a battle where no one is who they seem, and the line between black and white is blurred.
Reception.
Critical reception for "Saint Marie" was positive, with Mania.com calling the book "confusing" and an "intriguing piece of work". Anime News Network wrote that the first volume was "A diamond in the rough; Saint Marie is as beautiful to look at as it is intriguing to read."