Yakei is the gluttonous and fearsome leader of the largest sarugami tribe in the Tekkanese islands, an expansive group of demonic macaques that ravage the mountain sides for human trinkets and flesh. When the previous patriarch was hunted by a samurai, causing an immense power vacuum within the troop. and ensued a civil war. Despite the title of leader of the Sarugami exclusively being a patriarch, Yakei pried herself through the ranks by adopting the same weapons and tools used by the samurai that felled the previous ruler. Becoming one of the few instances of yokai using human smithing and technology to their liking.

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After effortlessly dominating her tribe into submission with her effective yet crude steel and gunpowder, Yakei quickly became obsessed with gaining the cultures and tools of humankind, believing that mimicking the garb and social customs of the samurai would grant her tribe the title of an official clan amongst the shogunate. But a bear cannot veil itself among the wolves as easily as the fox. The sarugami are yokai, immense, grotesque forms of the average macaque. Yakei has seized armor pieces throughout the valleys, but not one could fit her suitably. Holding an immense collection of samurai artifacts, hoping with each caravan raided, she will find the attire that suits her so.

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