NISA's Producer mentioned some stuff about the game and series :
The Legend of Heroes: Trails of Cold Steel series is actually part of an overarching series, which began way back in the 1980s. There have been several sub-series within this main series, but Cold Steel in itself falls within what fans refer to as the “Trails series”, which kind of a loose translation of the word “Kiseki”. Starting with The Legend of Heroes: Trails in the Sky (1, 2 & 3), then two games that were unfortunately never released anywhere, but Japan called Ao no Kiseki and Zero no Kiseki. After that, we come to the Cold Steel saga. The reason they’ve divided it into different games is that each sub-series takes place in different regions of the world. So, the Trails in the Sky games took place in Liberl, the Japan-only releases Ao no Kiseki and Zero No Kiseki took place in Crossbell, and the Cold Steel series takes place in the Empire of Erebonia.
As you can probably guess, it’s a really long and involved series, definitely the type of game for people who love lore and love to get lost in game worlds. To give massive praise to the creators of this series, the President of Nihon Falcom, Mr. Toshihiro Kondo, joined the company because of The Legend Of Heroes series; matter of fact, it was because of the series before the Trails series, which is called the “Moonlight Witch Trilogy”. He’d actually played that trilogy back when he was in college and he loved the games very much, which led to joining Nihon Falcom, and then he was able to write some additional story parts for that trilogy. He and another colleague actually built this entire world of the Trails series together.
Trails of Cold Steel III's story begins one and a half years after the events of II, and the main protagonist Rean is now a little bit older. Rather than being a student now, he’s become an instructor to a New Class VII. This actually relates to people who have just discovered this series and wondering if they can jump in, the simple answer is yes they can! This is because although Rean is older now, he’s still the main character and is in charge of the growth of the New Class VII. In a way, they’re kind of similar to the player, as they have a lot of things that need to be explained to them, so in general TOCS III is a great place to start whether you’re veteran or a newcomer to the series.
The localization team has been having a lot of fun because when you work on a game like this you can tell if people are enjoying their work on a project, and this is from my experience of having worked on localizing a number of projects in the past. A lot of attention and care has gone into this project, and the team is doing their best to tackle any rising challenges. As the team works more on this project they’ve had a lot of fun learning about all the different plot points of the series, and are determined to make sure everything connects perfectly for fans.