In FOURTH WORLD by Lyssa Chiavari, a boy named Isaak, who lives on Mars in the near future, finds himself transported back in time thousands of years, to Mars' ancient past, where he encounters a civilization on the brink of destruction. There he meets Nadin, who enlists his help in finding a way to save her people. The two teens are both on the #asexual spectrum, and the series addresses their journeys of self-discovery.