Endless Winter #1 - Cover:

rainingbells on March 18, 2007

Endless Winter is only planned to be a limited 3-issue series, and exists within the same universe as Sune , though some fifteen years earlier and over in the alien sectors of the galaxy.

While you don't need to read one comic to enjoy the other, it does give a wider view of the universe in which both stories exist. Not to mention, you may recognize some characters and organizations mentioned between the two series.