Set a year after the world - changing events of the first game, the veterans on the cast have grown up and are undertaking new challenges. (cheatcc.com)
I think Chieko changed it because she didn't like the idea of overwriting and erasing the past events of the first game like that. (shmuplations.com)
Set two years after the events of the first game, Valkyria Chronicles 2 follows the story of military cadets dispatched to suppress an insurrection in the southern part of the country. (randomnpc.com)