maimaiちゃんのテーマ (maimai-chan's Theme) is the official theme song of maimai-chan, the cheerful mascot character who also serves as the public face of the maimai rhythm game series on social media. The track was commissioned to celebrate the official maimai Twitter account reaching 1,000 followers, a milestone that sparked the idea of giving the character a proper theme of her own. The song was produced by YMCK, a three-person chiptune unit known in the game-music scene for their nostalgic 8-bit sound. Tomoyuki Nakamura (中村智之) handled composition and arrangement, Takeshi Yokemura (除村武志) wrote the lyrics, and Midori Kurihara (栗原みどり) provided the bright, cheerful vocals. The result is an upbeat chiptune pop number at 136 BPM, built around a simple, catchy melody that mirrors the mascot's lively personality. The lyrics alternate between English phrases, "maimai is fun / it brings you a pleasure", and Japanese lines that reference the game's round screen (丸い窓の中), reinforcing the welcoming, playful spirit the series aims to project. The promotional video, rendered in pixel-art style, shows maimai-chan dashing through colorful game stages packed with easter eggs, including visual nods to classic Sega titles Space Harrier and Fantasy Zone, and even a fleeting appearance of the Dreamcast logo. These details reflect YMCK's deep affinity for retro gaming culture and add a layer of discovery for eagle-eyed players. In maimai, the track originally appeared under the ORIGINAL genre category before being moved to its own dedicated maimai genre in later versions. Its Master chart, initially rated level 9 at launch, was revised upward across multiple game updates and now sits at level 12 with a constant of 12.4, reflecting both the series' evolving difficulty standards and the chart's lasting challenge for seasoned players.