One serene day, siblings Nunnally and Lelouch Lamperouge unwind beneath a tree. Upon Nunnally's request for a tale, Lelouch, devoted to his sister's happiness, employs his unique Geass power to weave an enchanting story. Awakening alone, Nunnally, once sightless, discovers a rabbit resembling Anya Alstreim, the Knight of Six. Pursuing the peculiar rabbit, Nunnally tumbles into a vibrant wonderland. Guided by Lelouch's narration, Code Geass: Hangyaku no Lelouch - Nunnally in Wonderland chronicles Nunnally's quest to return home, encountering a myriad of familiar and colorful characters on her journey.