Kakisuke is a talking monkey whose origins are deeply rooted in Japanese folklore, particularly the tale of Momotaro. He once fought alongside the folk hero Momotaro as one of his animal retainers. His fate was altered by a past misdeed: the accidental killing of a crab by hurling an unripe persimmon. This act of negligence led to a lawsuit from the crab's family, an event that etched lasting guilt into his psyche. This remorse surfaces as profound melancholy whenever the incident is mentioned, anchoring his identity in unresolved regret.

Following his defeat alongside Momotaro, Kakisuke was condemned to labor in Animal Hell, a realm specifically designed to punish those who harmed creatures during their lifetime. In this role, he enforces punitive measures on sinners as part of a torturer cadre, alongside Shiro, a dog, and Rurio, a pheasant. Despite his duty in meting out justice, his demeanor remains pervasively tinged with penitence, a quiet echo of his past transgression. His subdued presence reflects a soul tethered to accountability.

Kakisuke's portrayal across narratives steadfastly aligns with his folkloric origins, emphasizing his unchanging duties in Animal Hell and the enduring weight of his guilt. His interactions with figures like Hōzuki and fellow underworld administrators underscore his place within hell's rigid hierarchy. While his abilities are not extensively detailed, his role involves implementing the detailed machinery of infernal justice, a task he performs diligently despite his melancholic nature. A notable aspect of his character is his inability to eat the fruit of his namesake, the persimmon, which serves as a constant reminder of his fatal mistake. His story intertwines folklore with themes of retribution and personal atonement, illustrating how past actions create a permanent record in the meticulous bureaucracy of the afterlife.