In the not-so-distant future, a new psychological disorder emerges among humans. Novel Fulminant Depressive Disorder (NFDD), a condition so severe it causes patients to fall into a coma due to overwhelming depression. Counselor LIN Xin-yan, whose best friend is afflicted with NFDD, crosses paths with WU Tian-rui, a brain science and engineering researcher. Combining their expertise, the two strive to piece together the inner world of the afflicted—the Abyssverse—in hopes of helping them break fr...