Higuchi, an eighth-year super senior at Shimogamo Yusuiso dormitory, carries the monikers "Master Higuchi" or "the Master," cloaked in a perpetually calm, detached air. His yukata-clad presence exudes cryptic wisdom, masking a simmering "proxy-proxy war" against Masaki Jōgasaki—a fellow super senior, film circle president, and former classmate from their shared past with Hanuki and the ramen stall owner.

When a Kyoto summer time-loop traps the dormitory, Higuchi fixates on recovering his vanished Vidal Sassoon shampoo. This pursuit spirals into chaos as a past version of himself pilfers the bottle, entangling timelines in absurd paradoxes. The loop’s unraveling exposes his meticulous paranoia as self-defeating, yet underscores his peculiar blend of logic and whimsy.

Though often a passive observer, Higuchi nudges events through veiled advice or orchestrated schemes. He manipulates the protagonist via Ozu’s pranks, deploying fabricated letters from "Keiko Higuchi"—a ruse by Akashi. His aloofness cracks sparingly for pragmatic acts, like waterproofing the dorm’s air conditioner remote, an action pivotal to untangling a temporal snarl.

As a long-term student and peer to central figures, Higuchi anchors the dorm’s chaos with enigmatic stability. His shadowed history belies a pattern of calculated interference, balancing mentorship and mischief—guiding and goading with equal subtlety, forever perched between sage and trickster.