An estranged son of Akadama who shows up in Kyoto dressed and acting like an English gentleman. He's got some kind of ongoing beef with Benten, and he's genuinely obsessed with never owing anyone anything—he'll throw money at a problem rather than accept a favor. This actually drives Nidaime nuts because Yasaburou keeps dodging payment and turning the tables, leaving Nidaime stuck owing him instead. The whole dynamic plays on his pride and his refusal to be indebted, which honestly makes him a pain to deal with but also pretty entertaining to watch.
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