Moroha once had a master named Yawaragi, who was keeping a life-threatening secret. In order to resolve the secret and protect her pupil, Yawaragi made an agreement with Jyubei.
and the last surviving one will become 
known as Kodoku, the strongest demon.
.وآخر ناجٍ فيهم سيعرف باسم كودوكو، أقوى شيطان
und der letzte Überlebende
El que sobreviva
El que sobreviva
pour être le dernier survivant
и последний, кто останется в живых,