いちげき！のテーマ (Ichigeki! no Theme) is a high-energy crossover port from Sega's rhythm game Ongeki, arriving in maimai でらっくす PRiSM on February 7, 2025. The track was composed by ヒゲドライバー (Hige Driver), a prolific producer whose contributions span multiple Sega arcade rhythm titles, and performed by the vocal unit いちげきしゅーたーず！ (Ichigeki Shooters!). Behind this unit name are four voice actresses who portray Ongeki characters: Okasaki Miho (as Hinata Chinatsu), Kubota Risa (as Fujisawa Yuzu), Asahina Maruka (as Yuuki Riku), and Naganawa Maria (as Suzushima Arisu). The song originally debuted as part of Ongeki's April Fools event titled "いちげき！", which explains its playful, punchy character, the title itself translates to "one strike" or "single blow." At 175 BPM, the track carries a brisk, charging energy that suits its event origins. In maimai, the Master chart (level 13, constant 13.4) packs 1,010 total notes, with a notably heavy 114 Touch-note count, making it a demanding full-surface experience. Unusually, the Master chart was co-designed by two charters, ロシェ@ペンギン (Roshe@Penguin) and はっぴー (Happii), a relatively rare collaboration on a single difficulty in the maimai DX series.