No, Naoto is not dead.
In the final and current timeline, a result of protagonist Takemichi's persistent efforts and numerous time leaps, Naoto Tachibana remains alive and well. This successful alteration of the past has ensured a positive future not only for him but also for other key members of the Tokyo Manji Gang.
Naoto's Status in the Final Timeline
Through the culmination of Takemichi's endeavors, the future was significantly changed for the better. In this revised 20th timeline, Naoto is alive and thriving. He has transitioned into a new professional role that aligns better with his interests and aspirations.
Instead of pursuing his previous career as a police officer, a job he reportedly never truly enjoyed, Naoto has found fulfillment as a journalist. This career path allows him to remain engaged and contribute meaningfully, marking a significant and positive shift from earlier, more perilous timelines. His survival and new profession underscore the success of Takemichi's mission to avert tragic futures.
