Nagami Ren

He is the reincarnation of "Renki," one of Serahime's followers. When the princess was defeated, he wished to receive a curse of his own will, and since then he has been reincarnating repeatedly while staying close to her soul.

He helps Kaoru, who has no memories of being a princess, and teaches her the "Sumikui no Gi", a way to atone for her sins. He looks kind but always puts Kaoru first, sometimes causing him to be careless about everyone else.