"Dual-ism of Mirrors" (鏡かがみのデュアル・イズム Kagami no Dyuaru-izumu) is the fifth Japanese opening theme of the Yu-Gi-Oh! ZEXAL anime, performed by petit milady. It debuted in the anime on April 14, 2013, and aired during episodes 99 to 123. It was replaced in episode 124 by Wonder Wings.