INFINITE WORLD is a Touhou Project vocal arrange by the long-running doujin circle SOUND HOLIC, featuring vocalist Nana Takahashi, that arrived in maimai with the MiLK PLUS update on September 18, 2018. The song draws from an unusual corner of the Touhou canon: it arranges 無間の鐘 ～ Infinite Nightmare, the photo theme associated with Hatate Himekaidou from Double Spoiler ～ Touhou Bunkachou (2010), a spin-off that replaces traditional danmaku shooting with tengu-style photography. The arrangement was handled by SOUND HOLIC producers SHU x GUCCI, with lyrics by Blue E and a rock guitar foundation by Josh. The original version appears on SOUND HOLIC's 2010 album 文 -BUN-, a collection built around the newspaper-carrying tengu reporters of Gensokyo. In maimai, INFINITE WORLD has seen its chart levels increase across version updates as the game's overall difficulty curve rose, eventually settling at its current constants from the UNiVERSE PLUS era onward. The Master chart (level 12+) was designed by 某S氏, a notes designer whose name appears on numerous Touhou Project charts in the series, while the Expert chart (level 10+) was handled by サファ太 (Safata). The track's brisk 167 BPM and Nana Takahashi's characteristically energetic delivery, switching between English phrases and Japanese verses, give the song a driving, stadium-rock feel that has kept it a recognizable pick in the maimai Touhou lineup.