When Tachibana ends up a captive of the squid worshippers, such is the Premier’s vanity that she commits herself entirely to a beauty contest between her and Tachibana regardless of the fact the winner will be sacrificed to a giant squid. Even so, she loses to Tachibana.
Jinguuji and a village trader (who develops a thing for him) soon find and free the Premier, and they discuss strategy over her first hot meal in days (she’s been through some shit). The Premier agrees to work with Jinguuji to kill the Giant Squid God and save Tachibana.
Alas, any admiration or affection she might’ve been developing for Jinguuji is dashed when he uses her as literal floating bait for the squid, whom we learn is very particular about the girls he eats. After a whole day, the squid finally takes the bait at dusk. All the while, Jinguuji has noticed his strength has been sapped of late.
As Tachibana is carried in a cage litter for the seaside sacrifice, she curses the fact she and Jinguuji chose now to have another big fight. She remembers the first one, when she (or rather he at the time) fell behind in his studies and got mad at Jinguuji for not being an easy tutor.
The “useless eggplant” moniker was born, and the two friends didn’t speak for days. However, present-day Tachibana isn’t about to die before she can make up with Jinguuji, so she busts out of the cage and manages to wrest loose her tiara, thus instantly charming the men holding her captive.
This plan backfires when the wives and lovers of those men threaten to kill Tachibana before the squid can. Jinguuji tries in vain to pull the giant squid out of the water with his diminished strength, but regains that strength and then some when he hears Tachibana give an honest and heartfelt rant to the villagers about not judging people by appearances and taking responsibility for themselves.
Jinguuji rips the giant squid out of the water and impales its head on the statue of itself where Tachibana is clinging to dear life. Wounded but still alive, the squid notices Tachibana and attempts to eat her, and the Premier, soaked in black ink, almost helps by pulling Tachibana in.
But then Jinguuji tosses her his trusty Damascus steel kitchen knife, and the Premier, who you thought could sink no lower, pulls what in Demon Slayer parlance could be called a “Sleeping Zenitsu”, which is to say that for a brief moment she does something incredibly impressive and cool—in this case lopping off the squid’s tentacles and rescuing Tachibana in style.
The timing couldn’t be better, because up until this point the Premier had been little more than a walking joke and punching bag. Here, she plays a crucial role in ensuring Tachibana is safe…and goes a step further by grilling the village’s god and having a feast. Her actions are so audacious, the villagers agree to give up their power struggle make her their new leader.
Naturally the Premier isn’t interested, and as she runs from the villagers, Jinguuji and Tachibana make up. It’s not surprising that Tachibana even forgot she was mad at him, considering how much happened to her over the course of a day.
The episode ends with them basically exchanging vows: Jinguuji is to never take his eyes off Tachibana, while Tachibana is to never leave him again. Unfortunately, the Demon Lords generals have now learned that Jinguuji’s power is diminished when he and Tachibana are separated. Their vows will be more important than ever as they draw closer to the capital.