Dicebox is a slice-of-life sci fi that, somewhere along the way, develops a major plot and a large ensemble cast. The story follows Griffen and Molly, two transient workers in a spacefaring society. They're happily married, but things aren't perfect-- Molly sees disturbing visions, and Griffen's past is coming back to haunt her.
Bonus points: Dicebox treats a vast array of races, classes, genders, orientations, and relationship types as mundane. Life isn't easy or utopian in Molly & Griffen's world, but that aspect at least presents a pleasingly hopeful vision of the future.