Naoyuki Okazaki is the father of the protagonist Tomoya Okazaki. He was married to Atsuko Okazaki, who died when Tomoya was still young, leaving Naoyuki to raise their son alone. In the aftermath of his wife's death, Naoyuki fell into a deep depression and turned to alcohol and gambling as coping mechanisms. This behavior cost him his job and led to a strained, often volatile relationship with his son. One day during an argument, Naoyuki slammed Tomoya against a wall, dislocating his right shoulder. The injury was left untreated for too long and became permanent, ending Tomoya's ability to play basketball. After this incident, Naoyuki began treating Tomoya with a distant, formal kindness, addressing him as Tomoya-kun rather than as a father would his son, which only deepened the emotional rift between them. Tomoya became a delinquent who avoided home and saved money to move out. Despite his outward deterioration, Naoyuki's underlying motivation was always to raise Tomoya into a proper man. He sacrificed everything he had, spending all his money on toys and things that would please Tomoya, even working tirelessly at any job he could find to provide for him. This backstory is revealed by Naoyuki's own mother, Shino Okazaki, who explains that he never remarried or sought his own happiness because he dedicated himself entirely to his son. Naoyuki's role in the story is as a source of Tomoya's trauma and delinquency, but also as a catalyst for Tomoya's eventual growth. In the After Story arc, after Tomoya becomes a father himself and begins to understand the weight of parental responsibility, he reconciles with Naoyuki. Naoyuki, believing his role as a father has come to an end, returns to his hometown to live with his own mother. This farewell is a moment of closure for both characters. Naoyuki's personality is defined by a combination of brokenness and quiet resilience. He appears unkempt, with sunken eyes, a stubbly beard, and a perpetually tired expression, and he often drinks himself to sleep in a messy, dark home. He speaks calmly and wears a forced smile that masks deep sorrow. He attempts to connect with Tomoya in small ways, such as offering help with a craft project or trying to share breakfast, but his formal demeanor and Tomoya's resentment make these efforts fail. His most notable ability is not a supernatural skill but his capacity for silent endurance and self-sacrifice, as he works hard and denies himself any comfort for the sake of his son. He also has the strength to let go when the time comes, recognizing that his part in Tomoya's life is finished. His key relationship is with Tomoya, a bond that evolves from antagonism and distance to understanding and forgiveness. He also has a relationship with his mother Shino, who provides the perspective that redeems him in Tomoya's eyes. Through Naoyuki, the series explores themes of parental failure, the difficulty of raising a child alone, the hidden sacrifices parents make, and the possibility of reconciliation even after years of pain.