Which one should I start playing?

I'm about to be finished with Orbit of the Void, and Orbit of Zero's PSP will only be released in September... So I want to try Isu, but I don't know what order to play... May I ask…I can still accept the scenes of Legend of Heroes 6, but the scenes of Legend of Heroes 12345... So I'm here to ask for advice,
(Forget about the old DOS version)

Answer 1

There were a total of seven novels in the " Yisu " series. Each novel had its own storyline and character setting. Therefore, if one wanted to play the " Yisu " series of games, one had to choose the right novel to start playing.

If you wanted to play " Isu: Twilight of Filgena " first, you would need to read the first chapter of " Isu: Twilight of Filgena ".

If you wanted to play " Isu: Origins " first, you would have to read the first chapter of " Isu: Origins ".

If you wanted to play each novel, you had to start from the first chapter of the corresponding novel.