Shitsurakuen [Manga]

It follows the story of Himoto Sora, a transfer student with a sense of justice and dreams of becoming a knight. Upon arriving at Utopia Academy, she learns of a virtual reality-like game played by the male students in which they use girls as weapons in battles for status and treat them as commodities. Seeing one of these girls being abused, she steps in and unwittingly becomes the first female participant of the game.