心象蜃気楼 (Shinshou Shinkirou), released in Asian English regions as Imagined Mirage, is a song by Japanese producer Orangestar that originated in CHUNITHM AIR before arriving in maimai MURASAKi PLUS on August 24, 2017. Featuring vocalist mary (めありー), the track is built around a brisk 190 BPM pulse with layered synthesizers, crisp guitar work by Moyashi, and earnest vocal delivery that anchors Orangestar's melodic pop style. The title translates roughly to "mental mirage," and the lyrics weave imagery of deserts, fading light, and distant horizons to explore the ache of searching for someone in a world that no longer reflects the self. The song holds a notable place in SEGA's rhythm game ecosystem as one of the first original compositions to appear in all three of its major arcade series, maimai, CHUNITHM, and オンゲキ, establishing a shared repertoire that later crossovers would build upon. Its jacket artwork features the CHUNITHM character Takasago Mizuho (高砂 瑞穂), and the in-game background movie uses the original music video directed and animated by Yuma Saito, first published on niconico in August 2016, ten days before CHUNITHM AIR launched. The maimai version of the song is trimmed to 2:18, slightly shorter than the 2:27 length used in CHUNITHM and オンゲキ. A separate arrangement sung by VOCALOID IA appears on Orangestar's first mini album 未収録OSC (Mishuuroku OSC).