Years ago, mysterious beings only known as kihei appeared without warning and overran the world. To confront this strange menace, the Twilight Academy was established to train students in black...

After taking a kihei as his Bride and overcoming the massive invasion known as the Gloaming, Kou Kaguro has finally earned some peace for himself and his friends. But as...

After narrowly avoiding a terrible fate at the school festival, Kou renews his friendship with his old classmates from Research, Asagiri and Isumi. As they pass the time peacefully, Asagiri...