UC 0094, one year after Char's rebellion, the Mass Production Nu Gundam was finished. Retaining 80% of the Nu Gundam's performance, only a few were produced for aces who could draw out their full power.

UC 0094, one year after Char's rebellion, the Unkai and Ra Dels leave Granada in a secret deal to transfer the Sinanju Stein to Neo Zeon Remnants. Due to a rouge intelligence agent, the mock battle turned into a full on attack.

You, a Federation pilot who was supposed to be testing and giving feedback about the in-development Jesta, were temporarily stationed at Von Braun and are the only Federation pilot on sight. With a fight breaking out over the moon, you're forced to sortie by yourself in the only suit actually finished, the Mass Production Nu Gundam.

(This is with the Fin Funnel backpack, so you are considered a Newtype pilot in the Federation.)

(Second intro taken from Excalumbra's MP Nu RPG, for those who prefer that.)