If you want a full game, get Losers, or Qurtuba if you prefer a dungeon crawler. If you like Losers, later you can get a campaign: Disgrace.
Bloodtears is an agnostic setting. It is a world to play. You need a system. Echoes of Bloodtears were characters to play inside of this setting. Now you can get a improved versión: Flesh & Bones. The Heretic Nun is a solo adventure. If you like this setting and making your own world you should get Bloodtears Companion.