Dakkodango Translations

Ok, I just got to the first battle, and I'd like to ask, is there a downside to sitting in the capital, collecting ether and upgrading your initial units to as far as your trainers allow you? I mean obviously I won't get a bonus to mind for completing a mission fast, but other than that? Again as far as I can see you can get a lot of mind by simply guarding and healing a lot. So, is there any point to finishing missions fast at all?

Some general tips on battles in this game would be nice too.

well, you do get more mana for capturing towns etc, and some artifact make missions a bit easier among other things

Your missions are ranked based on the time it takes to clear them, and give you more bonus ether/mana. SS is the highest rank.