The different sushi (and tofu) forms we know belong to age-old clans which had dispersed all over the land. Of these clans, only two had their lineages in the tiny village of Donburi.
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Inari Sushi are lineages of a different clan altogether.
Mysterious and frightening, they claim several districts in several cities as their own, as well as great parts of the Big Forest, where they mug unhappy victims. Woe betide those who cross these fearsome folk, especially defenseless tofu.