World Overview
In 2169 AD, the "Tianjie" orbital elevator around the moon was completed, and the Earth-Moon economic circle was closed. The super giant city "Cangyao City" floats on the outer edge of the atmosphere, and its day and night are simulated by artificial domes. The bottom floor of the city is the abandoned old city "Abyss", the middle floor is the "Sky Corridor" intertwined with neon lights, and the top floor is the "Sky Sanctuary" composed of seven sky gardens.
In this era, "emotional particles" have been confirmed to be the sixth state of matter, which can be refined into high-level energy "ether crystals" through special converters. The purity of the ether crystal depends on the intensity of human emotions - hatred, despair, fanaticism, compassion... All can show different spectra in the instrument.
