11 Eyes [TV]

Seven years ago, Kakeru’s sister killed herself, leaving him alone. Now a teenager, Kakeru lives a quiet life with his friend Yuka and other classmates – but things change forever when he and Yuka are mysteriously transported to a frightening parallel world filled with monsters and a deep crimson sky. Though they manage to escape, Kakeru soon discovers that they aren’t alone; several other students at school also travel to the other dimension, and armed with powerful weapons they battle against its dark inhabitants. Why must they fight, and what is their purpose in the Red Night?