Kiriko, a permanent resident and frequent patron of the hotel bar, is consistently seen gazing through its windows using a multi-colored telescope. His origins, initially mysterious, trace back to hell, from which he was banished due to repeated misuse of a hellish box—a device capable of sending individuals to the underworld without direct consequences for its user.

He possesses large green eyes reminiscent of underworld demons and has a short stature. Kiriko typically wears a simple brown yukata adorned with flower patterns, a tan hat, and white socks over brown sandals. His slouched posture and simian facial features contribute to an overall monkey-like impression. Generally perceived as eccentric, he frequently makes remarks about the view outside that bar patrons find peculiar or nonsensical.

A significant element of his story involves the hellish box, which he eventually entrusts to Neko Tsukahara. This item becomes pivotal, offering Neko the choice to send antagonist Masaki Osoto to hell. Kiriko also plants cryptic clues in the hotel's waiting room; solving these reveals a hidden compartment containing the "Key of Hell," essential for accessing the box's full power. His motivations for these actions remain ambiguous, though he displays specific awareness of the hotel's mechanics, particularly regarding the consequences of opening hell's gates.

His relationships are largely observational. He shares the bar space with Osoto but shows no direct alliances. Forum discussions speculate about his potential significance, with theories proposing he could be the hotel's true owner or manager, though unconfirmed. His reactions to discussions about hell, especially concerning the moral weight of condemning others, hint at a deeper connection to the underworld's workings. He remains the only guest whose personal room within the hotel remains unseen.