パーフェクション (Perfection) is a maimai original composition by Hiiragi Magnetite (柊マグネタイト), featuring Hatsune Miku on vocals. The track arrived in maimai DX UNiVERSE PLUS on April 28, 2022, as part of the BLACK ROSE ちほー6 area, the next unlockable song being デーモンベット. It belongs to the 言ノ葉Project (Kotonoha Project) 2nd Season as Side Story Essence 5, a narrative-driven series that weaves character backstories through song. The song's in-game flavor text paints a somber fantasy tableau: an accomplished alchemist who devoted his life to the pursuit of "perfection" lost his beloved daughter and, with his composure shattered, clung to a dubious rumor about an island where a perfect substance could be made to revive her. Carrying his daughter in his arms through an endless journey, he arrives at a place where a long-forgotten and terrible history lies sleeping, a retrospective on the lost memories of a girl named Elly. This story infuses the track with a melancholic, driven energy that matches its brisk 190 BPM pace. The music video was created by illustrator Shikimi (しきみ), and the track features guitar work by C'Na. Composition, arrangement, and lyrics are all handled by Hiiragi Magnetite. The song's Master chart (level 13, constant 13.4) was designed by 隅田川星人 (Sumidagawa Seijin), while the Expert chart (level 10+, constant 10.6) was designed by Jack. The track runs 2:33 and never appeared in any other music game.