In a distant era blending magic and science, the world was divided by God into Elde, the realm of science, and Fandavale, the realm of magic. When the nefarious witch Cendrillon resurfaces in Fandavale with ambitions to dominate both worlds, she hunts for a powerful artifact known as the 'key.' Souta, a young boy hailing from Elde, crosses paths with the enigmatic girl Akazukin and her articulate wolf companion, Val, discovering his pivotal role as the coveted key sought by Cendrillon. As Akazukin, Val, and the valiant Fairy Musketeers rally to shield Souta from Cendrillon's malevolent forces, a thrilling battle unfolds to safeguard the extraordinary power within him.