In a cyberpunk world, humans have abandoned Earth to seek a better life elsewhere, leaving robots to rule the city. Elixa, the only human left, is a curious young girl navigating this mechanical world. Elixa lived with her robot caretaker until he was forcefully taken away for disassembly. Determined to save him, Elixa embarks on a journey to the city center. Along the way, she encounters friendly and hostile robots, uncovering secrets about the world and her own origins. "Circuit Heart" is a story of bravery, discovery, and the quest for identity in a world where humans have become a distant memory.