Naoyuki is Tomoyas father. His mother Atsuko Okazaki passed away when he was young, leaving him alone to raise himself. Following an accident, Naoyuki turned to alcohol and smoking, frequently arguing with his son over trivial matters. During one such argument, he pushed Tomoya against the wall, dislocating his right shoulder. After this incident, Tomoya refused to leave his room and went to the hospital only when it was too late. Since then, Naoyuki has treated Tomoya more kindly but as a stranger rather than family. This hurt Tomoya even more, causing him to become a delinquent and avoid returning home early. He plans to run away from home, as revealed by Kotomis path in the story.
In the movie, Naoyuki works a graveyard shift instead of staying home and becoming a drunk. He also cares about his relationship with Tomoya and even
As revealed from Shinos story about Naoyuki, even though his wife has died and has become depressed, Naoyuki sacrificed everything in his life just fo