At Shiki’s request, the agency gang is off to his home village of Kinshigo, now that he’s ready to learn the fate of his parents. It’s bound not to be a pleasant stroy, but Inugami thinks it’s only right for Shiki to know if he wants to, and he does, for closure and to be able to move on.
After a little girl with pink hair gives Shiki a hard look (my first instinct, these two share mom), Inugami runs into his Uncle Akio, who tells Shiki that his parents are both dead. His father died before he was born, and his mother died when he was five. The reason he’s traumatized is that he walked in on her body at such a young age.
Having heard the news, Shiki returns to his friends to join them for ice cream, but even Kabane can tell he’s putting on a brave face, Akira tells him not to point that out so tactlessly, but Shiki can’t deny something is still troubling him. Enter Nobimaru, joining them at the bath, suggesting they go see the fireflies.
While Nobimaru is clearly still trying to trick Kabane out of his lifestone for Inari, that he takes Shiki into the woods helps trigger a memory involving a peculiar tree. This sets Shiki on a path of landmarks leading to a Creepy Shack, the very sight of his real trauma. It wasn’t seeing his mother’s dead body, but something far worse: her mother being forced to breed with a monster.
As Shiki recovers from the shock, Nobimaru inspects the now-empty shack, where there is still evidence of medical equipment and claw scratches. He recalls a report a year ago involving Shiki’s uncle, who was trying to make the local folktale about “golden silk” come true, which would expose kemono to the world, something both Inari and Inugami must prevent.
Still, Inugami kept Inari from “disposing” of Shiki’s uncle, knowing Shiki himself deserved to face him for what he did. When Inugami meets with Uncle Akio at his house (formerly Shiki’s parents’ house), he’s pleased to find Inugami is willing to spill the beans about his plan, because he doesn’t think what he’s done was wrong.
Shortly after he was born, Shiki came down with a nasty case of the Flu, and Akio coerced Kumi into horrific cross-breeding experiments with various kemono in the forest, hoping to find the pairing that would give them the legendary Healing Silk that’ll make them rich and make Akio famous. And while Kumi died in the process, Akio can report that he was successful in finding that pairing—no doubt the little girl is the result of that success.
Inugami happened to be recording Inugami’s confession/rant on his phone for Shiki to listen, and basically gives Shiki leave to do what he wants. Shiki grabs and suspends Akio from the neck with his silk, and out of deference for the years he took care of him, Shiki is willing to give his uncle a quick death.
While he has every right to make him suffer, there’s no escaping the fact that killing Akio will make Shiki a killer, and likely deprive that girl of her only guardian. Will Shiki follow through on his threat, or further weigh the enormity of his uncle’s crimes with the consequences of taking a life? We shall see.