The assistant and daughter of Katsushika Hokusai (Nakajima Tokitarō). She also used the name Katsushika Hokusai, sharing the same Heroic Spirit with her father due to outer-god influence that caused the father to take on an octopus form. Nanaya's current appearance using the Hokusai card resembled a male version of Oei. In theory, a tentacled father should have appeared by his side, but Nanaya removed that variable from the summon through negotiation with his system.
