"The Watchman Series" (JP: 番人シリーズ)
Amo’s shoes, Zodyl’s coat and Rudo’s gloves are all revealed to be parts of the “Watchman series,” items that were worn by a single person long ago. Zodyl failed in his attempt to make his own Watchman series, but through his experiments discovered how to make giant trash beasts with vital instruments at their core. He has devised a plan to use one to travel to the Sphere.
"We're inside a Trash Beast!!!!" lol
This episode made me love the Santas, such a cool duo, also it was hilarious to see everyone’s reaction when they realized they were in a trash beast lol.

I'm most likely wrong, but I thought the Jinki in the series might just be the three we know. The symbol represents a triangle and three circles, but they probably have another meaning. It's surprising that they've been inside a foul beast so far, so in its stomach or intestines if it were a normal creature, but that might make it easier to get out.
I call this the "nothing ever happens" show. Holy shit - does Rudo actually have any unique dialogue? He's spent the past 5 episodes just parroting back whatever lore dump person is in front of him. Seriously, the writers are channeling MGS's Snake for him.
The entire episode, we found out 3 things - Zodyl can make trash beasts, everyone is in a trash beast, and the plan is to fly it to the sphere. What else happened? Nothing. We get a cliffhanger where next week again, we'll have something minor happen in the first 5min, then go around the horn and hear everyone talk and make faces for the next 20min before the episode ends when something else is about to move forward - only for it to repeat again next week.