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 free. Yet, amidst their investigation, a subtle connection begins to form between them. As they went closer to each other, they also draw nearer to uncovering the truth behind the illness. Each of us lives within a sealed universe of our own. And behind that fissure of the collapse, lies either a deeper abyss of despair…? or a different kind of salvation?