Keisuke Sanada is the bodyguard of Hinako, the daughter of a renowned billionaire. He considers Hinako's well-being as the most important aspect in his life. As he was searching a way to lengthen Hinako's lifespan, which is being shortened by an incurable disease, he found himself invited to the magi sacrificing ritual of Ragnarök by Jin Arizuka, where he had the chance of saving Hinako's life. Although unwilling, he agreed to participate in the ritual, which was referred to as a survival game by the Game Master, as the Sleeping Demon (眠り鬼 nemuri oni), hunting down other participants to take their life force and use them to cure Hinako.
Powers and Stats
Name: Keisuke Sanada, Sleeping Demon
Powers and Abilities: Superhuman Physical Characteristics, Magic, Regeneration (Mid-Low), Life Force Absorption, Healing, and his 51 cards can regenerate themselves as long as the core (Keisuke himself) is not destroyed.
Attack Potency: Wall level
Lifting Strength: Peak Human
Striking Strength: Wall Class
Durability: City level (Took several direct hits from Ryuichi whose attacks are strong enough to break a magical weapon)
Stamina: Very high
Range: A dozen of meters
- Mistilteinn (ミスティルテイン, misutirutein): A set of 51 cards that Keisuke uses as his main offense. Keisuke himself acts as the core of the set; in other words, the defensive Joker, which regenerates both the cards and Keisuke's body when they are attacked.
Weaknesses: If his magical weapon gets destroyed, he'll die instantly
- Stormbringer (傷だらけの忠誠心 （ストームブレディンガー） sutōmuburedingā; English for Storm Bringer, Japanese for Wounded Loyalty): When any of Mistilteinn's 51 cards hit the enemy, Keisuke can activate their true ability: devouring the life force of their target.