Clockwork Planet Vol 6

Clockwork Planet Vol 6 by Yuu Kamiya. A Sci-Fi manga rated Older Teen, published in English by Kodansha in 2018.

A thousand years after Earth died, the planet was rebuilt entirely out of gears. Naoto Miura, a high schooler with an extraordinary ear for machinery, ends up repairing a beautiful automaton named RyuZU, and the two get swept into a conspiracy that could break the world.