"Overdose" is a J-pop track by Japanese singer-songwriter natori (なとり), added to maimai DX CiRCLE at the edition's launch on September 18, 2025. Originally released as a digital single in 2022, the song became a breakout viral hit in Japan, accumulating hundreds of millions of streams across platforms and becoming one of the defining J-pop tracks of the early 2020s. Its inclusion in maimai marks the song's only appearance in a rhythm game to date. The track sits at a relaxed 118 BPM in the POPS&ANIME genre, driven by a minimalist production with a thumping bassline and natori's understated, breathy vocal delivery. Lyrically, "Overdose" revolves around a metaphor of emotional dependency in a toxic relationship, the chorus repeats "Overdose 君とふたり やるせない日々" ("Overdose, the two of us, restless days") and "Overdose 君とふたり 甘いハッタリ" ("Overdose, the two of us, sweet bluffs"), pairing a catchy melody with bittersweet subject matter. The song originally appeared on natori's 2022 album of the same name and runs approximately 1:39 in its maimai edit. For maimai players, the MASTER chart (level 13, constant 13.0) was designed by じゃこレモン (Jako lemon) and features 468 notes with a heavy emphasis on slide patterns, including rotating one-stroke slides and cross-lane symmetrical configurations that demand precise hand coordination. The EXPERT chart (level 9+, constant 9.6) was designed by Luxizhel. In-game unlockable titles, "君とふたり やるせない日々" (earned on the 1P side) and "君とふたり 甘いハッタリ" (earned on the 2P side), directly quote the song's chorus lyrics, rewarding multiplayer play.