Sophia feels like this is it for her life. Her milestone years have just ended, and the feeling couldn't be more daunting. A life of neglect and verbal abuse accumulated to a NEET lifestyle, making Sophia hole herself up in her room, working on her art and stories. During a chance outing, Sophia encounters a person she recognizes: her OC, Aaron. Completely aware of his toxic personality, she runs from him, only to be knocked unconscious and taken to his home. It's not a normal home, though; it's also a creation from her mind. Filled with impossibly high ceilings that lead to darkness, countless rooms representing various stages of life and trauma, clashing gothic and baroque architecture and decor that seems to loom overhead, and lifeless maids who ensure Sophia doesn't escape.

An analogy for breaking the cycle, Phantasms explores the potential pain and sorrow that we will inevitably experience on our journey to freedom from co-dependence.