Always cold and hungry yet full of longing to see the wonders of the Abyss, the still-human Nanachi was lured, along with a good deal of other disadvantaged children, to their doom by the dastardly White Whistle Bondrewd the Novel.
On the way down to the unreassuringly-named Sea of Corpses, Nanachi meets the ebullient Mitty. Weary at first, they hit it off almost immediately, buoyed by the exciting, life-changing adventure they’re about to undertake.
Did I say exciting and life-changing? I meant nightmarish and life-ruining/ending. One by one Bondrewd comes for the children until Nanachi and Mitty are the only ones left.
Neither has any idea what’s happening to the others until Bondrewd comes for Mitty, but not Nanachi, in the night. But Nanachi, now all alone, follows them, and sees and hears things she shouldn’t.
Bondrewd takes Nanachi’s disobedience as an auspicious event, and places them in a tube right beside a frightened, already-trapped Mitty, and calmly explains how the “experiment” is going to go down. The two descend to the Sixth Layer, where a horde of formerly-human things gather around their tubes.
Then the ascent begins, and all of the Curse is transferred to Mitty in a graphic, gruesome, and thoroughly upsetting sequence. Nanachi can only watch in the other tube, absolutely powerless to help. Mitty was Nanachi’s one and only true “treasure”, more important than any relic they might have found in the Abyss.
But, as we know, Mitty isn’t gone. Well, not totally. To Bondrewd’s delight, the double-dose of Sixth-Layer Curse not only took Mitty’s human form, but made it impossible for her to die. She is constantly disintegrating, regenerating…and suffering.
Nanachi flees Bondrewd’s clutches with Mitty (though it’s highly likely he lets them go) and eventually finds a place to live. But there is nothing Nanachi can do for Mitty. It’s not that they can’t put Mitty out of her misery due to emotional considerations…it simply isn’t possible.
Not until Reg and Riko came around. With his Incinerator, which Nanachi calls “Sparagmos”, or the “light that returns to the cardinal point”, Nanachi believes she can finally free Mitty’s long-suffering soul from what’s left of her body.
Reg asks for time to think it over, and worries that if he kills Mitty, Nanachi will feel they have no more reason to live, and might take their own life. Nanachi promises they won’t, and convinces Reg of the only right and proper course of action when they tell him that when they one day do die, Mitty will be left alone, suffering for all eternity.
After preparing a tasteful site for “sending off” Mitty, Nanachi only halts Reg from firing Incinerator for one last goodbye to her treasure, then tells him to do it. The ensuing inferno consumes every bit of Mitty until there’s nothing left. Just like that, she’s gone.
It’s ruinously sad, but I’ll admit, a HUGE relief her suffering is at an end. After all, her last words as a human to Nanachi in that tube were “kill me.” Hers was the kind of pure lasting suffering that’s hard to imagine or even comprehend, but I can grasp the catharsis, even if the hurt remains in the hearts of those who sent her off.
Things thankfully take a lighter turn when Reg awakens to find Riko is also awake, and starting her rehabilitation. Riko takes an instant liking to the cute and fuzzy Nanachi, and both Nanachi and Reg appreciate Riko’s far superior culinary skills.
After going through that emotional, visceral ringer, It’s awfully nice to see Riko back to normal. Then she asks if there wasn’t someone else there besides the three of them, and recalls a dream that made her think that.
The creepy dream we saw part of last week is put into context thanks to Riko. She is consumed by a kind of skin (representing her deep illness) and can only cry and panic, but when she sees that terrified, crying eye—Mitty’s eye in the waking world—she calms down, stares back, and tries to comfort her.
Then, after Reg sends Mitty off, Riko perceives it as Mitty (or rather, her soul) being restored to its human form before passing on. Then Riko realizes she needs to “get going”, and follows the light back to consciousness and out of her wounded stupor.
Upon hearing this “dream”, which was likely something more significant, Nanachi looks grateful that someone saw their treasure in the moment she finally achieved her freedom.
Nanachi takes Riko and Reg to a kind of healing hot spring, and enjoys watching Reg squirm as Riko proceeds to have no qualms whatsoever about bathing with him naked, all while quietly asking Mitty to wait “a little longer,” which could either be interpreted as Nanachi planning to take her life and join Mitty soon, or not until after she’s lived a life that now includes two new potential “treasures” in Reg and Riko.
After removing the mushrooms from her arm (another highly painful, unpleasant ordeal), Riko eventually regains the ability to lift her arm and even move her thumb. Reg blames his crappy amputation attempt for the state of her arm, but Riko doesn’t blame him; she asked him to do it, after all. She also heared from Nanachi how tearfully and desperately Reg tried to save her, and thanks him for that, regarding her nasty scar as “precious proof” he protected her.
Riko, like Reg before her, asks Nanachi if they’ll join them as they continue their journey further down the Abyss, and Nanachi agrees. The credits then roll over a lovely montage: Riko ties her backpack to a balloon and releases it, and they prepare for their journey as it makes its harrowing ascent past all the layers they’d passed, even requiring Marulk to free it from a branch and repair it.
It eventually reaches Nat, who looks shocked and elated to finally possess evidence of Riko and Reg’s progress. Having completed their preparations (and the construction of a big, sturdy new backpack), the new party of Riko, Reg, and Nanachi leave Nanachi’s cozy house behind, in search of trying to satisfy that most unstoppable longing for the unknown.
Meanwhile, in Bondrewd the Novel’s lab, he notices one of dozens of lights has gone out; a light signifying Mitty’s life. He is proud of and grateful to Nanachi for having finally gotten it done, as if letting them escape was yet another experiment. And he’s eager to meet her again. Ouzen was right; she’s kind and pleasant compared to this evil bastard.
And there we are; that’s a wrap! At least until a second season comes along. While I can assure you there are very few shows I’d want to jump into the second season of immediately, and this is one of them, I think a good long rest is in order, to recover from the emotional wounds it left in this final, epic, horrendously devastating yet still somehow hopeful, and achingly beautiful finale. I want to believe Riko’s mom is waiting for her. I have to.