Keroppe, a enigmatic frog, enlists five high-school girls as magical apprentices, orchestrating their metamorphosis into wish-granting witches. He bridges their ordinary existence with an enchanted flower shop concealed behind a closet portal, acting as both mentor and facilitator. Within the shop’s mystical confines, the girls train to fulfill desires through melodic rituals and choreographed spells under his watchful supervision. During performances, he unlocks passage to the Witchverse—a pocket dimension where their powers fully awaken. Tasked with intertwining the mundane and magical, Keroppe crafts opportunities for the girls to hone their abilities and navigate self-discovery, yet maintains an impartial stance, never intervening in their personal struggles or growth. His origins, motives, and evolution remain obscured, anchored solely to his role as the enigmatic conduit between realms.