Akihito Kanbara finds himself in a courtroom and faces an unexpected jury for a peculiar lawsuit. Having turned into chibi idol versions of themselves, Mirai Kuriyama, Mitsuki Nase, and Sakura Inami are led by Ai Shindou to present incriminating evidence and deliver their dazzling verdicts.

However, Akihito is not the only one who is assigned a case. Pressed with varying charges, other characters of Kyoukai no Kanata stand trial and endure the comedic truth of their quirky habits.