World Piece, Vol. 3 (manga)

Lucas comes face-to-face with the Nurulans, the aliens responsible for creating the artifacts that are shrinking planets across the universe. Their leader demands that Earth be turned over, leaving Lucas, Lully, and Mitton no choice but to accept an unlikely alliance with a rebellious Nurulan, Exxo.

Not all is smooth sailing when the world thief Sylvian reappears and activates a Nurulan artifact, throwing them all into the Black Gateway! Can the new group trust each other enough to navigate out of the gateway and get back on track to finding a way to restore Earth?