After the seven Kiznaivers recovered from their collective “overload”, they decided to stay away from each other for the rest of the Summer. When they return to school, no longer bearing Kizna scars and no longer connected, Yamada seems to rub salt in the wound by describing all the crazy experiences they had over the Summer, even if things got a little too intense at the end.
Hisomu isn’t able to stay away from Katsuhiro, rightly worried he won’t properly feed himself (not that Hisomu does either, with those cans), and despite everything that’s happened—nay, because of it all—Nico still loves everyone and wants to stay connected. The pure joy she exhibits upon taking the hands of Hisomu and Kacchon, spinning around giddily, was infectious.
These three can be friends again without major issues. But what about the others? Harder to say. Tenga hopes that if Chidori gives him a strong, unambiguous rejection, she’ll feel better…but she knows she won’t. We barely see Yuta and Honoka, as the latter won’t talk or listen to the former.
Then there’s Sonozaki. The mayor informs her of an imminent investigation, and in the meantime, the Kizuna Experiment is being shut down, meaning everything she’s worked for in her life is about to go down the drain into a sea of futility. She can’t bear that outcome, and so races to the nearest ledge, and as she seemingly falls, Kacchon feels her pain in his newly-appeared chest scar, as strong and horrible as ever.
His desire to find and help her leads him to the secret subway station to the school, where he finds an Urushii who, perhaps feeling a bit of guilt right about now, is receptive to giving him, along with Hisomu and Nico, more answers about what exactly they were a part of.
This project isn’t just about pride for Sonozaki; it’s about her life, and the lives of those she lived with. Once she was connected to eighteen other kids, including Kacchon, she began to feel all of their combined pain as well as her own, multiplied nineteen times. Only with the use of harsh drugs that dull all her senses allow her to function.
Worse still, her body never returned any of the sensations she absorbed form the others, leaving some the ones who are still alive as serene mannequins, unable to function at all. Once Kacchon hears they’re still alive, is allowed to meet with them, and sees the hollow husks they’ve become, he breaks down and cries, as if Sonozaki’s hold on his emotions was weakened or suspended.
Kacchon clearly wants what Sonozaki wants: to undo what’s been done to their friends, as well as to end her suffering. The Kizuna System, it would seem, was always critically flawed and untenable. But maybe there’s hope for the unfortunate souls involved.