As the curtain falls on his fleeting existence, K. Roth Binew (Jesse Eisenberg), a self-styled visionary, embarks on an existential journey to decode the mysteries surrounding mortality. Accompanied by his quirky companion, Mills Joaquin (Jesse Eisenberg), Roth's odyssey is ignited by the shocking diagnosis of a rare terminal illness, one he has resolved to face with courage.
With time slipping away, K. Roth is driven by a long-held desire to unearth the profound wisdom his father failed to provide—a haunting monologue that has lingered throughout his life. As he traverses the convoluted maze of self-discovery, he invites his adversary and neighbor, Reginald, to partake in the a celebration of life and mortality.
As the hourglass of life empties, K. Roth and Mills scheme to organize a funeral that is both morbid and grandiose. Their escapades lead them to a local liquorsmith, where they seek fleeting joy, and even involve a goat sacrifice as a desperate attempt to curry favor with the unpredictable gods.
In his belief that love holds the key to the universe's secrets, K. Roth attempts to reignite a romance with Marla, his former nanny, during a heartwarming picnic that ultimately concludes in disappointment. He remains undaunted and continues to venture into a series of misadventures, including a flirtation with a prostitute ([Colombe Jacobsen]) and a visit to a psychic, all in his quest for the enigmatic meaning of life.
As the specter of his wake and inevitable end cast a shadow over him, K. Roth spirals into despair but ultimately finds comfort in an unforeseen reunion with his family at a nearby church. Initially reluctant, his brother Karl and mother ([Jill Larson]) warm to his plea for reconciliation, leading K. Roth on a path towards healing.
As the final moments approach, K. Roth and Mills get ready for their farewell gathering, cherishing every second while reflecting on the life lived and the enigmas that remain. As the mournful atmosphere of the wake sets in, a cast of characters gather, witnessing a touching spectacle. The air vibrates with the tones of K. Roth's dance, paired with Mills' haunting melody, “If I Was Real.” A collective grief begins to lift with K. Roth's striking one-woman play, Remembrance of Dawn, which seems to encapsulate the essence of his being.
However, just as the mood starts to lighten, Karl and Dr. Schoenberg interrupt, insisting K. Roth end the wake, deeming it another instance of his erratic behavior. Unfazed, K. Roth presses on to resolve loose ends, avenging himself against Reginald and relinquishing material possessions. Mills delivers a heartfelt poem that serves as a eulogy for K. Roth's existence.
As the wake reaches its zenith, the ghostly figure of Lampert Binew ([Jim Gaffigan])—K. Roth's father—materializes, visible only to K. Roth. In an emotional confrontation, he demands acknowledgment of his father's abandonment, which leads to a profound revelation: Lampert did not desert K. Roth but died without imparting any guidance. He shares wisdom, suggesting the essence of existence is not encapsulated in elaborate philosophies but in living fully.
Facing the reality of his mortality, K. Roth experiences an awakening, accepting the futility of his plight, even referring to himself as a "stupid, drunk, scared, dying man." Inspired by his father's words, he concludes the wake with an exhilarating song and dance. As the final notes resonate, K. Roth's illness claims him, causing him to collapse into an upright coffin. The mourners honor their last respects as the film reaches its conclusion. In a powerful finale, Mills ignites K. Roth's lifeless form, consigned to oblivion as the credits begin to roll.
