|Japanese Voice||Takaya Hashi|
|English Voice||T.A. Taylor|
Isaka is a shikabane from the Shichisei who is known for his ability to open portals and create barriers. In the anime adaptation, he was later killed when the shikabane himes manage to easily break his barriers while surrounding him.
In the manga, Isaka was revealed to have enjoyed a wealthy and extravagant lifestyle, but despaired in the knowledge that his material possessions would be worth nothing once he was dead.
He enjoyed watching people be torn apart by wild animals in cages as a way to alleviate the boredom that he felt in his old age. One day he encountered Hokuto and Hazama and was killed by them, before rising again as a shikabane and joining the Shichisei.
He would later face Makina in battle inside one of his locales, only to be killed by her, following an one-on-one duel.