Shen Zhongyi, just another high school student, experienced a major shock when he found out that his love interest was an extraterrestrial serving at the Milky Way Customer Service Department. This department's objective was to tackle problems arising from aliens residing on Earth and to "regulate" human experiences with them, which could entail erasing, manipulating, or eliminating memories. To safeguard his existence and cherished moments with her, Shen Zhongyi assented to work at the department part-time, which was full of perilous situations.