Just when Habara is about to open the Moon Temple, he’s stopped—by the real King of Distortion, in the flesh, inhabiting the body of Tanaka Shirou, who was beside him all along. The King “collaborated” with the late Teratsuki for the purposes of a grand experiment in healing the distortion in peoples’ hearts, by first drawing it out and giving it form.
In Kei’s case, the distortion is Saotome Masami, but it’s her unrequited feelings for Takeda Keiji that caused the distortion. To be more precise, it was the embarrassment from having those feelings, then creating a personality that would uphold the fiction that it didn’t matter, when all that did was bottle up her pain and facilitate the distortion.
But Kei isn’t embarrassed by her feelings anymore, and she’s done running and hiding from them. She is able to walk away from the King, who applauds her effort, and she ends up with Shirou—and Boogiepop—in the control room.
There, Boogiepop deduces that the King of Distortion has been imprecise with his abilities (see: Zooragi) because he was only recently “born” when Shirou came to the Moon Temple that morning. He was born from Shirou’s guilt over not knowing what the late Kamikishirou Naoko, whom he used to date (and who died in the Manticore incident).
Kei can attest to Shirou’s guilt and pain, but not just for not knowing what Naoko thought. Boogiepop antagonizes the King into transporting the three of them into a suspended state several hundred feet above the city, warning him that, like other possibilities that took form in the human world, if he becomes a threat she’ll deal with it.
Kei, ever the disciplinary committee president (AKA “Natural Police“) plays peacemaker, and Boogiepop follows her lead. They don’t want to fight him; they still aren’t even sure he is a threat, just a possible one. But Kei manages to “free” Shirou from the King by getting to the root of his guilt: it’s less about knowing Naoko’s heart and more about his own.
The truth is, Shirou didn’t know how he felt about Naoko, even in the end. She then tells him what she thinks Naoko would say if she were there: “Before you start worrying about other people, you need to take care of yourself!” The King suddenly plummets to the ground, and suddenly Kei is back in the control room with the code to unlock the Temple.
People start waking up and exiting the Temple, all of them with some kind of great weight they once bore having been lifted. It could be said that even though it was cut short sooner than originally desired, the King of Distortion’s experiment was a success. Sakiko bids goodbye to Boogiepop, asking what they’d do if she became an “enemy” (Boogie wouldn’t hold back, natch).
While Keiji is scouring the Temple looking for Touka, he runs into Kei, who tells him she followed someone she was worried about, but that person wasn’t Keiji. With her distortion healed, she can smile and shake hands and remain friends with Keiji without any trouble.
Keiji and Touka eventually reunite, and Touka falls asleep on Keiji’s shoulder as they take the train home. In a dream, or something else, back on that ruined earth of the distant future, Keiji climbs up a hill to meet Boogiepop, who asks “how did you know it was me?”, to which he replies that he wouldn’t mistake “a friend’s face.” Like the King with Shirou, Touka is Boogie’s vessel in the human world, and Keiji is dating Touka. That’s never not going to be an interesting experience.
And that’s all for Boogiepop wa Warawanai, a bizarre, ambitious, and intriguing show that asked big questions and wasn’t afraid to philosophize at great length in between spurts of action. It was a pleasantly offbeat show in the same vein as Sakurada Reset, Subete ga F ni Naru, or ACCA, other shows that are comfortable and confident spinning dense tapestries of their own quirky reality.