The sprawling underground ballast area where Ayato and Kirin fall becomes a crucible in which Kirin makes the crucial move from her uncle’s path to one of her own, encouraged by Ayato to do so with the assurance she won’t be alone on such a path. Considering how decisively he handles the boss dragon (albeit reaching his 5-minute limit), Kirin knows she has an ally who is strong and kind.
What she needs a little help with, which isn’t surprising considering how young and impressionable she is, is realizing her own agency and value as an individual, not as the tool of another. She also decides (due to Ayato’s nervous vacillating) that she might have a chance with Amagiri-senpai, making her an official member of the harem, if she wasn’t already.
For too long Kirin’s uncle has gotten away with using her guilt, her sense of obligation, his bluster, and the back of his hand to cow Kirin to do his bidding. No longer. In a very simple but elegant scene, she takes one last slap, but blocks his second. She refuses to cut ties to Ayato, and instead looks her uncle in the eyes and cuts ties with him.
She’ll do things her own way from now on. Will costs come with that choice? Of course, not least because her uncle doesn’t really have any other means of advancing in the bureaucracy. He could grow desperate and do something unpredictable. And while some may say Kirin is swapping out her uncle’s influence for Ayato’s, it’s clearly that of the latter who has her own best interests at heart.
Kirin asks Ayato to a rematch to serve as the first step on her freshly paved path to betterment and happiness. And it’s a very awesome duel at that, with Kirin displaying her usualy mastery of swordsmanship, but Ayato besting her by continually switching up his weapons from sword to spear to daggers, and finally to his bare hands, which she was open for. She’s soundly beaten, but when the match ends she’s smiling ear-to-ear, because it’s her loss, not her uncle’s, and it was also a valuable learning experience.
After the match, Kirin asks if she can join Ayato, Julis and Saya’s training sessions after all, no longer bound to isolation, which one could argue had stifled her exposure to fighting styles and led to her loss. She’s determined to become stronger so she can save her father. I assume winning a Festa or three would give you enough clout to request sentencing modifications for family members, otherwise, wouldn’t Kirin be better served studying law?
Her uncle shows up one more time, but Kirin doesn’t waver in reiterating she no longer intends to let him use her. She’s also backed up by Ayato, who blocks one of the uncle’s cowardly cheap shots for her, and by Claudia, who promises she won’t take kindly to someone trying to sabotage or corrupt one of her beloved students…and her high-ranking mom will hear of any attempts.
Kirin also thanks her uncle for all the good things he did, but because he never did it for her, only himself, he leaves without responding to her heartfelt emotions. She then gets on first-name basis with Ayato (likely annoying Julis) and is later asked by Saya to be her tag partner. All the while, Ernesta and Camilla prepare to take the next step in their grand plan. Even as only semi-bad guys so far, they’re still preferable to Silas.