Akamanto Kamen, called Red Mantle, is a male spirit dwelling in an abandoned school. He is draped in a distinctive red cape and conceals his face behind a white eye mask. This mask hides his extraordinary beauty, as seeing his uncovered face directly causes intense physical reactions—including headaches and fevers—in any observer, regardless of gender or preference. Consequently, his charm irresistibly affects most women, though it fails against individuals with specific attractions, such as those favoring younger boys.

Affiliated with the school, he is among spirits summoned by the Holy Student Council, marked by a red badge. He has a sister spirit, Blue Hanten. In one documented incident, he reluctantly adopted a top hat to distract entities known as the Sailors XO, expressing dissatisfaction with this role.