In the descriptions it says that it is a visual novel, so if you don't want to read, don't complain about it x). Go play a mindless, boring game; you have no taste! This game is ftw :3.
To beat Greg, i found out it's best to use archers, with a cupid bow on hard mode. U can get it from a main mission somewhere, i think. Bring maxed level poison,rage, and tiny ("stop" skill if u dont have the bow.) Make sure u use poison, because it does % damage, and Greg has A LOT of hp.
Easy way to make unlimited money: recommended to be in tassel foot. Get the Vanguard "Upgrade down" vessels and then you'll have lots of supplies. Sell everything. You'll make lots from the silver each time.