Soul-ride ON! is the second opening theme of the anime series 怪獣娘～ウルトラ怪獣擬人化計画～ (Kaiju Girls: Ultra Kaiju Anthropomorphic Project), a franchise that reimagines classic Ultraman kaiju as anthropomorphized anime girls. The song was composed, arranged, and written by Yuuyu (ゆうゆ), a prolific creator deeply rooted in the Japanese doujin music scene whose work has appeared across numerous BMS tournaments and rhythm-game franchises. The track is performed in-character by the three core voice actresses of the series, Riho Iida as Agira, Suzuko Mimori as King Joe, and Risae Matsuda as Alien Guts, each channeling the personality of their respective kaiju persona into the vocal performance. At 146 BPM, the song delivers an energetic pop-rock arrangement that matches the upbeat tone of the anime's second season opening sequence. In maimai, Soul-ride ON! debuted on December 20, 2019, during the launch window of maimai DX (maimai でらっくす), tied to the limited-time Kaiju Girls Area collaboration event where players could unlock it by accumulating distance in the event map. It became permanently available by default starting from maimai でらっくす PLUS. The song was later removed from the arcade lineup on March 24, 2022, as part of the standard rotation cycle for licensed anime content in the DX series. A self-cover instrumental version also appears on the original 2018 single release.