I assume Naoki dies in the train since he didn't get off or he fell a sleep. I think he just fell a sleep and…
my thoughts were that he was sick. when kiichiro attacked him, he hurt his head really really bad, and then got off the hospital without getting checked properly... after that his head continued to hurt. in one of the last scenes, he's walking but loses control of his legs. maybe a neurologic trauma?
in one of the last scenes, he's walking but loses control of his legs. maybe a neurologic trauma?