To discover a power sphere, Kaizo is sent to Space Pirate colony on a secret mission. He disguised himself as a ship cleaner and become spy among the pirate. Knowing this, Axion insisted to join him as they discover war plan that Captain Vargoba prepared.
If there are some unclear things, you can check it by reading the first book -> https://www.wattpad.com/story/130661564-my-story-with-you or simply ask the author