A single OVA that thinks like a novel. Three stories across four centuries, each one grinding on the same question: what does it mean to stay human when you're the last humans alive? The 80s animation is thin by today's standards, but the ideas move through you like radiation you can't stop. This is what happens when anime takes hard sci-fi seriously instead of using it as window dressing for action.
Two young couples volunteer for humanity's most audacious undertaking: the Space Seeding Plan. As civilization looks toward the stars, the government selects Adam and Hannah, along with their counterparts, to carry the biological blueprint of human existence into the far reaches of the cosmos. After grueling physical and psychological evaluations, they board the Ozma, a spacecraft carrying their genetic legacy to distant worlds where humanity might take root. What unfolds is a meditation on sacrifice, purpose, and the weight of being chosen for something greater than yourself. The film captures the quiet intensity of ordinary people thrust into an extraordinary responsibility, exploring what it means to volunteer your future, your identity, your very existence for a vision you'll never see realized. The tone balances hard sci-fi concepts with intimate human drama, focusing on the emotional and philosophical dimensions of long-distance space travel and generational thinking. This is for viewers drawn to contemplative science fiction that privileges character and consequence over spectacle, examining how individuals grapple with legacy and meaning in an expanding universe.