11eyes

11eyes is an anime adaptation of the visual novel 11eyes: Sin, Damnation, and the Atonement Girl that aired in 2009.

The story follows Kakeru Satsuki and Yuka Minase, childhood friends who go about their ordinary lives as high school students when one day the sky turns red and they find themselves in a different world filled with monsters that they call the "Red Night". After repeatedly finding themselves in this alternate world, they meet other people in the same predicament and band together survive while having to deal with grotesque creatures known as the "Black Knights" whose ultimate goal is to kill them.