BIOGRAPHY OF 11 EYES
Satsuki Kakeru's life takes a twist with the death of his sister who committed suicide. Since then, Kakeru lived an empty and miserable life after losing her only sister. Minase Yuka, Kakeru's childhood friend tries to help him so that everything returns to the way it was.
One day they are both transported to a world called Red Night, where they appear monsters that attack them, but Yuka and Kakeru try to escape. When they thought they had escaped from the Red Night, those monsters appear again but this time they are not alone, 4 others were transported with them. To survive and escape the attacks from Red Night, they have to fight against the Black Knights.