ARAIS is an instrumental original track composed for maimai DX Splash by Jin Senbonmatsu (千本松 仁), a guitarist and composer who spent over a decade at Konami writing for the GITADORA series before joining FIVE LEAF CLOVER. The song is a driving, guitar-driven rock piece at a steady 180 BPM, built around crisp riffing and high-energy percussion, stylistically in line with Senbonmatsu's arcade rhythm-game pedigree. It debuted on September 17, 2020 as the first Perfect Challenge song for the Shuwashuwa Area (しゅわしゅわちほー), a special unlock zone in Splash. Players had to accumulate 504 km of in-area distance to attempt it. The music video, crafted by suckerpunch, reuses two bronze statue models that had previously appeared in the song UniTas, creating a subtle visual callback within the maimai original lineup. ARAIS's MASTER chart, designed collaboratively by Sukiyaki vs Happy, is a level 14 (14.4 constant) that clocks in at exactly 1000 notes, a round-number milestone that stands out among the Splash-era catalogue. Early in its life, a bug allowed a phantom Re:MASTER chart to appear under specific conditions; Sega patched it in version DX1.11 on September 25, 2020. Beginning with maimai DX UNiVERSE, ARAIS became unlocked by default, and its Basic difficulty was later raised from 5 to 6 starting in UNiVERSE PLUS.