Chasing Stars Across the Cosmos

Earth was assimilated by an unknown substance called Blackstone; in an instant, civilization was reduced to nothing. Yet a high school boy was rescued by a cosmic organization to which his older sister—who had gone missing years ago—belonged. Seeing the state of Earth, he had no choice but to set foot into the deep, cold universe. The protagonist follows alien crew members of other species, relying on substances and technology humanity has never encountered to adventure through the cosmos. The secret of his sister's disappearance, all kinds of unknown mysterious technologies and powers, conflicts and clashes arising from interests among the universe, the games between various interstellar organizations... A youth, together with other crew members, will embark on a cosmic expedition to seek the truth, expand understanding, save his home planet, and search for answers. — Description from novelcodex.orgFull novel: Chasing Stars Across the Cosmos — read the rest free on N​o⁠v​e⁠l​C⁠o​d⁠e​x⁠.​o⁠r​g⁠