Despite having the opportunity for a promotion, the depressed mulch factory worker, Val, attempts to take his own life in a bathroom stall at work. His plan is interrupted by the incessant singing of his irritating co-worker, and he ultimately decides against it. Following this tumultuous moment, Val breaks up with his girlfriend, Natasha, and resigns from his job. In a turn of events, he aids his best friend, Kevin, who had attempted suicide three days earlier, in escaping from a psychiatric hospital.
Val expresses his belief that suicide is a solution contrary to what society teaches, and the two form a pact to commit this act together. However, when the moment arrives, Kevin panics and prevents Val from pulling the trigger. Choosing to make the most of their final day, they decide to indulge themselves with a meal at a diner. During this time, Kevin confronts his past when his former bully, Brian, walks in, reminiscing about the torment he inflicted on Kevin.
Kevin harbors a profound desire for revenge against Dr. Brenner, the psychiatrist who abused him as a child. After learning from a receptionist that Brenner won’t be at work until later in the day, Val decides to help Kevin plan their route to confront him. Meanwhile, Val discovers Natasha is pregnant; he had intentions of marrying her but faltered out of fear.
The two friends partake in an exhilarating ride at a motorcycle park owned by their friend, Donny. An unfortunate accident leaves Val injured, leading Kevin to confront an impolite gas station attendant named Wyatt. He brandishes a gun not to rob but as a statement, eventually buying the necessary supplies for Val.
Later, Val attempts to reclaim money stolen from him by his father, Lyndell, resulting in a chaotic fight that sees Kevin using a tire iron to intervene. Val continues to unravel his past by returning the engagement ring he purchased for Natasha. In a strained encounter with her, he attempts to give Natasha some money for her support, but she discourages him and urges him to seek therapy. Meanwhile, Kevin grapples with his violent urges against Brian but ultimately refrains from attacking him.
As the day unfolds, Kevin follows through with his vengeful intentions by confronting Brenner. However, in a moment of panic, he forgets to take off the gun’s safety, allowing Brenner to overpower him. Val arrives just in time, mistakenly believing Brenner intends to kill Kevin, and reacts by shooting Brenner fatally.
In an emotional car ride, Val confesses to Kevin that he desires to live, wanting to be there for his soon-to-be child. When a police chase ensues, they seek refuge with Donny. After giving Donny the car keys, they escape on dirt bikes while Donny distracts the authorities. However, Kevin’s desperate mindset leads him to suggest that Val should take the blame for the murder. In a tragic turn, Kevin takes his own life, leaving Val devastated.
Years later, Val, now incarcerated, receives a heartfelt visit on Father's Day from Natasha and their daughter, reflecting on the consequences of their desperate choices.
