Ibuki Shikibe functions as Takashiro Giou’s trusted personal secretary and a pivotal figure within the Giou Clan, hailing from its Shikibe branch. As the elder sister of Mizuki Shikibe—Yuki Giou’s late mother—and Tsubaki Shikibe, she occupies the role of maternal aunt to Yuki. Her responsibilities span administrative oversight and logistical operations, coordinating Zweilt guardian deployments and disseminating vital clan intelligence. Renowned for her unflappable composure, Ibuki navigates interactions with formal speech and measured politeness, starkly contrasting her younger sister Tsubaki’s fiery impulsivity. Her devotion to Takashiro manifests in meticulous care: monitoring his well-being, orchestrating secure travels, and performing rituals like tea preparation. Though she admits to past deceptions toward others, she upholds unflinching honesty toward Takashiro, whose reliance on her competence remains absolute. Under Takashiro’s directive, Ibuki and Tsubaki initially masked their kinship to Yuki. However, as tensions escalate, both sisters openly fret over his clashes with the Duras and Reiga, their protective instincts clashing with clan mandates. While adhering to hierarchy, they privately wrestle with secrets surrounding Yuki’s lineage, hinting at their longing to openly claim their kinship. The Shikibe family’s legacy intertwines with the Giou Clan’s feud against the Duras, having safeguarded Yuki from infancy. Though Ibuki’s personal history remains veiled, her choices consistently prioritize clan interests, threading an intricate balance between duty and latent familial bonds.