イーヴィルガール (Evil Girl) is a CHUNITHM original song by Fushi featuring vocalist Yoshino, brought to maimai as part of the ongoing cross-title collaboration between Sega's rhythm game series. The track was originally introduced in CHUNITHM LUMINOUS PLUS before arriving in maimai でらっくす CiRCLE on September 18, 2025, as a linked unlock requiring play in CHUNITHM, an arrangement that later shifted to default availability from the CiRCLE PLUS update onward. The jacket artwork features the character Raichi Aeshima (ライチ・アエーシュマ), a recognizable figure from the CHUNITHM universe. Clocking in at a brisk 180 BPM across a 2:26 runtime, the song pairs an aggressive, high-energy instrumental with Yoshino's sharp vocal delivery, painting a picture of a narrator fed up with a hypocritical, rotten world. Its lyrical content leans into theatrical nihilism and rebellion, with recurring motifs of breaking down and destruction. The maimai MASTER chart, jointly designed by Luxizhel and 鳩ホルダー, sits at level 13+ (constant 13.8) with 1,120 total notes, placing it among the more demanding offerings in its version.