I see a lot of recommendations here, but here's a couple that are off the track.

Sound! Euphonium

Silver Spoon

Terror in Resonance

Planetes

Texhnolyze

Kinos Journey - both series are great the 2nd is more like the original source

Mushishi

If the game has any way to trade, it's possible to buy power. Wow Classic or Guild Wars 2 are probably your only really options.