Lime hails from a magical world accessible only through a gate opening behind the full moon once a month. Her true demonic form displays distinct non-human traits: pointed ears, a long tail, wings, and cat-like ears. To infiltrate human society in Tokyo, she utilizes exceptional transformation abilities, primarily adopting female human disguises. Her mission, undertaken with partner Bass, is to retrieve six stolen power gems scattered across the city. These gems absorb negative human emotions, transforming everyday objects into monstrous BEMs. Lime frequently employs physical violence against Bass for his inappropriate behavior, often punching him or swinging mallets provided by Poogie, their shape-shifting slime companion who becomes tools at her command. While undercover, Lime attends school and forms a friendship with human girl Mizuki Seo, revealing a capacity for connection outside her world. Confronting BEMs like the neglected-candle-hating Mr. Candle or the failed monster Mr. Purse born from credit card woes demands tailored strategies to neutralize each threat and recover the gem. Driven by responsibility for the gems' retrieval, Lime's actions focus on her mission, though not all gems are recovered within existing episodes. Her background as a magical denizen and development through human interactions remain central to her documented activities.