From the in-game context, Sicae is at least some time before MBML. It's inferred that the clans merged into one in MBML by the time when the MBML MC meets Sicae's MC. So Sicae is technically a Prequel and MBML is the Sequel? -shrugs-
Thank you very much for your help, but I also need NiiChan to answer me, because he is the only one who knows, but I am not saying that your information is worthless, thank you very much.
