In a world of powerful, devilish beings, affirmed by his noble lineage, Aramoto Kakumo is supposed to exist to rid a world of the powerful beings of darkness. This mission was given to him by his brother Kishimoto Kakumo shortly before his inexplicable disappearance. At the same time, he presented him with his inheritance in the form of a crystal necklace, which has unimagined abilities when a secret spell is spoken aloud in front of it. However, only a heavenly angel knows this spell, and Aramoto has to beg for his help. As a result of his adventures, Aramoto loses his family and his home Marlorvina. When he is about to ask the heavenly angel for help, he fatefully meets a young woman who pretends to know where this holy angel is, whom Aramoto should ask for help. Both now set out together to carry out Aramato's mission. Aramato experiences how he becomes another in the descendant of his mission given to him by his brother Kishimoto Kakumo so that he realizes that the love of two people is greater than the salvation of the world.