After another battle in which Yuuki takes care of the last Shuuki on his own, Kyouka praises him, and it motivates him to keep getting stronger so he can save her. Then his reward acts out the fantasy of saving Kyouka, gathering her in a princess carry so she can kiss him. It’s a rare instance of Kyouka letting her guard down and being a little vulnerable, if only because she’s in reward mode.
Back at base, Tenka is still loitering around, and when talk of Yuuki’s inspiring big sister comes up. Yuuki regales her and the squad of a time one of his classmates and his big brother threatened him, but she came to his rescue, judo-throwing the older brother (who is three times her size). To her surprise, Yuuki also puts the younger bully in a lock, having learned a thing or two from his sis. This pleases her to no end.
Anyone would envy having a tough, cute big sis like Wakura Aoba, and no doubt Yuuki has been missing her every day, and remains both confused and intrigued by the possibility she’s still around, in humanoid Shuuki form. When Nei detects what looks like a kid being chased by Shuuki, Shushu and Himari are dispatched to save her, only for the “kid” to be one of those humanoid Shuuki.
When a second humanoid Shuuki shows up, Shushu and Himari are in big trouble, so despite Kyouka giving Yuuki the rest of the day off to bathe and recharge, they have to head right back out to save their comrades. By the time they arrive, a third humanoid is there: the one who looks like Aoba. When he charges at her, she shouts for him to stop, and he obeys. Kyouka is thrown from his back, and Aoba surrounds her with lesser Shuuki. By the time she’s carved her way through them, the humanoids and Yuuki are gone.
It’s a rare defeat for Uzen Kyouka, but more than that, the fact Yuuki is more than a pet or slave, but a comrade and friend as well, makes it that much harder for her that they’re now separated. He waks up naked, being licked all over by the petite humanoid (her saliva has healing properties). Then Aoba comes in, acts in a way Yuuki immediately clocks as his big sister, and they share a touching embrace.
Aoba, along with her comrades Zanibako Coco (petite) and Yuno Naon (sultry), act pretty much like the humans they used to be … they just look a lot cooler and sexier now. Their chemistry and interactions prove just as charming as the ones among the DDF members. It’s only when Yuuki brings up the DDF that their eyes start to glow and they adopt a more menacing posture, but that soon fades and Aoba returns to the big sister Yuuki knew and loved.
I actually like how much of his time with Aoba the humanoid Shuuki depicts them as less two-dimensional than the heels they make themselves out to be on the battlefield. At the end of the day, they are victims of Mato-related accidents making the best of their new half-monster lives. Like Yuuki, through Aoba I was able to empathize quite a bit with them. These aren’t monsters to be defeated by the DDF, but people with the same souls thery had as humans.
That said, Aoba and her two lieutenants have higher-ups who seemed a lot more one-dimensionally eeeeevil, and it’s clear they have no interest in negotiating or co-existing with the DDF. Suruga and Himari are worried not just about Yuuki, but Kyouka, who holes herself up in her room after they return, but once Yuuki transformed back into a human, Kyouka became a Yuuki detection radar, since she needs to give him his battle reward.
Tenka, Yachiho, and Sahara join forces with Kyouka, Shushu, and Himari for the Rescue-Yuuki mission, but none of them know yet how much more complicated things have gotten. Now that he knows what she is, I doubt Yuuki will allow his big sister to be harmed. It’s your classic case of family-vs-friends divided loyalties, adding a welcome and fascinating wrinkle to what had been a black-and-white fight.