Devil of Evening, Crepus (宵()の魔人()クレプス Yoi no Majin Kurepusu), or simply known as Crepus, is the Partner Z/X of Yamato Tennoji (Le ciel). Possessing good-looking, succubus-like appearance. She is an assassin sent by Domeki Foundation to Le ciel, and is ordered to kill him if he failed a mission or planned to escape. She usually cooperates with Le ciel as his partner to achieve a mission, but it is impossible to understand her true intention beyond her mysterious looks and words.