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Attachment The first Nobunaga's Ambition game was actually the second in the series, originally titled "Nobunaga no Yabou: Zenkokuban".
Though it was the second game in the series, it was the first ported to the U.S. and so it was simply titled Nobunaga's Ambition in the West.
subdirectory_arrow_right Nobunaga's Ambition: Awakening (Game)
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In an interview with the game's producer Michi Ryu published on Noisy Pixel on June 22, 2023, in response to a question asking if Nobunaga's Ambition: Awakening would bring together all of the series' history in honor of its 40th anniversary, he stated:

"The goal of this series is to create a realistic experience of Warring States Japan, but other than that vision, we are not too conscious about the past that much. Although there may have been staff members who were. Even if we had created the same system as past games, ideas change as people change. As gaming platforms evolve, we can also show more, so I didn’t worry about it even if we made the same thing in the past. For this game, the concept is a living officer who thinks for himself and act accordingly, but I focused more on how we wanted to show things next, and not on doing something that has not been done before."

In a separate interview with Siliconera, he clarified that the game's concept was the most impactful change made during development, since in previous Nobunaga's Ambition titles, officers only acted when players ordered them to. With Awakening, officers are able to think and act on their own in various situations without orders, which Ryu felt was closer to how humans act in real-life and to how various officers during Japan's Warring States period would have acted without orders from daimyos, the latter of which they tried to show in the game.
person ProtoSnake calendar_month January 27, 2024
Nobunaga’s Ambition: Awakening Interview – Producer Reflects on 40 Years of Nobunaga and its Future:
https://noisypixel.net/nobunagas-ambition-awakening-producer-interview/

Interview: How Nobunaga’s Ambition: Awakening Builds on the Past Entries:
https://www.siliconera.com/interview-how-nobunagas-ambition-awakening-builds-on-the-past-entries/