Although his hair and glasses appear unkept, Kagemori Mamoru belongs to a clan of ninjas who have been covertly safeguarding the Konnyaku family, their nearby community, for more than four hundred years. From early childhood, Mamoru has been devoted to protecting Konnyaku Yuuna, the family's daughter. Whenever Yuuna faces danger, Mamoru assumes his ninja garb and becomes a proficient ninja, always prepared to assist her.