Treating the punch line abalone like D&D monsters

Nigai (lit., "boiled shell") = steamed in soy sauce

Why would abalone be a local specialty of Yamanashi?

Long ago, in order to transport abalone from the coast to Yamanashi, they put soy-soaked abalone into barrels and carried them on horseback...

...but between the rocking and the horse's body heat, the flavor penetrated the meat nicely, so that's how it started.

Maybe they're abalone born in trees?

You sure like that story pattern, huh, Sanae...