“You are what the world makes of you,” not the other way around, is a bit of advice Amadeus (Mozart I assume) once gave Mash, which she shares with Ritsuka during a little pep talk in which she assures him she has faith in the choices he’s made and will always be by his side come what may.
I like the sentiment, and Mash and Ritsuka are cute together, but it’s one of those scenes between the two that would have more emotional impact if a.) we’d seen any of the adventures they’d had to this point and b.) Rituska wasn’t just a cipher, which is all he’s ever supposed to be.
In any case, their month of menial labor pays off, as Gilgamesh summons them back to court with a real mission: investigate the city of Ur. He holds his Holy Grail in his left hand, but both Ritsuka and Merlin notice something odd about it, and conclude that it’s not the grail keeping the seventh singularity open. That grail lies…elsewhere.
The journey to Ur requires traversing lands filled with demonic beasts, which Ana disposes of without any issue. But once they hit the dense, sweltering jungle Merlin even equates to a Reality Marble, the beasts are nowhere to be found.
Instead, they encounter what seems at first like a character in another show: a lively woman in a bulky cat mascot costume and sneakers calling herself Jaguarman, whom Ana isn’t fast enough to catch. She vanishes as soon as she appears, but it’s clear it won’t be their only encounter.
Once they reach Ur, the people seem to be safe, but the jungle is encroaching the city blocks, and once all the townfolk are gathered in the central plaza, Merlin notices the dearth of men and deduces that they’ve made a deal with a goddess to sacrifice a man a day in exchange for safety.
It’s a raw deal, one that is particularly offensive to Ritsuka, but it’s a deal they can’t break when Jaguarman arrives, because despite her goofy appearance and demeanor is a legit Divine Spirit neither Ana nor Mash have a hope of defeating without divine help of their own. The only upside is that she hasn’t killed Ur’s men; but she is using them for hard labor.
Instead, Jaguarman thrashes both of the Servants without breaking a sweat in a scintillatingly fast-paced battle, and Ritsuka must reluctantly call for Merlin to transport them back to the outskirts of Uruk to make their report to the king. Ana asks Ritsuka why he’s not accustomed to such sacrifice by now when he’s sacrificed plenty already (including Olga-Marie Animusphere) to the cause of saving human history.
Ritsuka says simply that he’s never gotten accustomed to it, nor will he ever be, matter how necessary it is. It’s the kind of attitude a hero needs if he’s going to accomplish his ultimate goals. Upon returning to their modest headquarters, the party is shocked when Gilgamesh appears at their doorstep, making a typically unheard-of house call—more of the world trying to make something of the ragtag group of heroes.