Miyo Inbami, a scion of the Hundred Devouring Families’ Inbami clan, leverages her family’s pharmaceutical and poison expertise to navigate the cutthroat hierarchy of Hyakkaou Private Academy. Separated from her sister Miri Yobami in childhood by clan rivalries, the pair forged a covert sign language to bypass restrictions on communication, sustaining a bond that fuels Miyo’s calculated maneuvers. Her polished demeanor—long black hair swept into a bun, a loose strand accenting crimson eye shadow and glossed lips—belies a strategist who substitutes the academy’s loafers for brown heels, subtly defying conformity. Miyo treats gambling as a petty diversion, preferring direct subterfuge: poisoning rivals, rigging games, and exploiting weaknesses. During the presidential election, she and Miri conspire to overthrow Kirari Momobami, dosing Yuriko Nishinotouin to seize her votes. In a Nim Type Zero match against Yumeko Jabami and Ryota Suzui, Miyo poisons Yumeko mid-greeting, only to face Mary Saotome’s interference. She escalates the clash with poison-tipped needles and antidote wagers, but Mary’s sharp deductions and Runa Yomozuki’s card shuffling unravel their plans. Forced to sacrifice Miri, Miyo later secures an antidote, balancing self-preservation with fractured loyalty. Her ruthlessness resurfaces in the Rock Paper Scissors Poker tournament, where she incapacitates Ibara Obami with toxins before confronting Mary again. This time, marked cards and a staged suicide gamble—a lethal pill bluff—test Mary’s resolve. Exposed, Miyo concedes defeat, begrudgingly respecting her opponent’s tenacity. Behind her schemes lies a twisted nostalgia: reuniting with Miri at Hyakkaou marked her happiest days, a truth that fuels her lethal risks. Heir to generations of medicinal and toxicological mastery, Miyo embodies the Inbami-Yobami clans’ struggle to retain influence under the Momobami. Each betrayal and alliance weaves self-interest with reluctant devotion to Miri, complicating her mercenary persona. Though she disdains vulnerability in others, her sister’s safety remains the fragile thread tempering her cruelty—a paradox that defines her every move.