ポケットからぬりつぶせ！ (Pocket Kara Nuritsubuse!) is an ONGEKI-original song that crossed into maimai でらっくす Splash as part of the ongoing collaboration between Sega's three rhythm-game pillars, maimai, CHUNITHM, and ONGEKI. Composed, arranged, and written by Masato Nakayama (中山真斗), a veteran composer whose credits span The Idolmaster franchise and numerous anime productions, the track brims with the bright, march-like energy its title suggests. The song is performed by マーチングポケッツ (Marching Pockets), a vocal unit built from three ONGEKI characters: the spirited Chinatsu Hinata (CV: Miho Okasaki), the lively Mia Kashiwagi (CV: Azumi Waki), and the gentle Tsumugi Shinonome (CV: Fuuka Izumi). The title's "nuritsubuse" (ぬりつぶせ) evokes a playful command to "color it all in" or "fill it completely," matching the upbeat, brass-accented arrangement and the group's marching-band identity. Originally introduced in ONGEKI SUMMER on October 17th, 2019 as part of Chapter 3 Side Chapter 2, subtitled "箱の中身はなんだろな" (What's in the Box?), the song arrived in maimai on March 4th, 2021, and later appeared in CHUNITHM NEW PLUS in August 2022. The Master chart, designed by ぴちネコ (Pichineko), carries a level 13 (difficulty constant 13.2) and is notable for its dense Touch-note layout, 140 Touch notes out of 770 total, roughly 18% of the chart, making it one of the more Touch-heavy offerings from the Splash era. The Expert chart was designed by 小鳥遊さん (Takanashi-san). The Master difficulty originally launched as a 12+ during Splash through UNiVERSE+ and was reclassified to 13 beginning with FESTiVAL, reflecting the chart's real heft at the upper-intermediate boundary. A long version and an instrumental arrangement were later released on the ONGEKI Vocal Collection 06 soundtrack, alongside individual solo versions for each of the three Marching Pockets vocalists.