Endless World is an original song created for maimai PLUS, the second arcade revision of Sega's maimai rhythm game series, released on May 9, 2013. The track was composed and arranged by Ryohei Kohno (興野亮平), with lyrics co-written by manami, a frequent contributor to maimai's original song roster, and Hitomi Terakado. Vocals were delivered by Miwako Hotate (保立美和子), a singer who earned the Best Vocal award at an audition hosted by TOSHI of X JAPAN and has since performed game theme songs, provided backing vocals for major artists, and collaborated in the musical unit "一樹の陰" with Yosuke Kinoshita. The song opens with a distinctive guitar arpeggio technique layered over a crisp digital beat, establishing an airy, refreshing mood. Hotate's warm mid-range vocals shift into clear, resonant high tones, and the interplay between lead vocal and backing chorus in the latter half stands out as a particularly memorable passage. The lyrics describe a personal, boundless world filled by another person's presence, themes of homecoming, connection, and emotional coloring woven through phrases like "ただいま" (I'm home) and "おかえり" (welcome back). The original PV featured simple purple-toned imagery designed to enhance a floating, suspended sensation. An interesting piece of production history: the instrumental track for Endless World was actually completed early in maimai's development cycle, before Kohno's other maimai original "Inu biyori." (犬日和。), but the song itself did not debut until the PLUS revision. Kohno later remarked that he had grown uncertain whether the track would ever make it into the game. An unused instrumental version titled "ガラスの向こう" (Behind the Glass) remains in the data of the original maimai release. Within maimai, Endless World has been charted across all five Standard difficulty tiers. The Expert chart was designed by はっぴー, the Master chart by ニャイン, and the Re:MASTER chart, added on June 21, 2019 in maimai FiNALE, by Jack. The song's in-game genre classification shifted over the years: originally labeled ORIGINAL, then ORIGINAL & JOYPOLIS, and finally maimai from でらっくす PLUS onward. Its jacket was redesigned for the maimai でらっくす update, where the gameplay video was also replaced with a static image of the new artwork.