Lulue acts as a supernatural guide and mentor to Tukishima Moe, empowering her with magic to defend Akihabara against threats to its "moe energy." Hailing from a mystical realm, she trains Moe in language-based spellcasting, first emphasizing English to thwart Kyoka Akira’s plans to study overseas. This objective drives Moe to hone incantations for battling rival magical girls, aided by Lulue’s instruction and enchanted artifacts—including transformation tools gifted by Megamisama, a supreme divine entity.

Expanded adaptations diversify Lulue’s duties, incorporating Korean, Spanish, Chinese, and French to align with the series’ educational themes. Weekly episodic structures pair animated narratives with live-action tutorials, extending Lulue’s presence beyond fiction into instructional realms. She steadfastly oversees Moe’s progression, strategizing against foes such as Mush—an exiled magical realm being who corrupts Kaori into opposing Moe.

Lulue’s personal history, motivations, and evolution remain undisclosed, with official narratives centering exclusively on her role as guardian and educator. Media neither explores her backstory nor developmental arcs, framing her solely through her function in enhancing Moe’s linguistic and combat expertise.