In the distant future, humanity's excessive reliance on technology led to the degeneration of their emotions. Artificial intelligence and robots calculated the instability inherent in human sentiment and, citing this as justification, initiated the ‘Human Extinction Plan’. The last humans on Earth engraved all remaining emotions onto a golden disc named “Zing” and launched the spacecraft ‘Zaiyin Hao’. Its mission was to seek out the emotional radio waves humanity had scattered across the cosmos, aiming to rebuild human civilisation. Upon learning of this mission, Earth's colossal computer matrix transmitted a ‘black signal’ into space, seeking to pre-emptively annihilate the remnants of human emotion. Yet Zing, who has just embarked upon her journey, appears utterly unaware of these events, nor does she sense the peril already lurking within her own destiny...