Atomcat

Reading the 'Tetsuwan Atom' (popularized in America as 'Astro Boy') comic book with his dad is Tsugio's one refuge from merciless school bullies. And even then, without a single friend, Tsugio can't catch a break. One day he finds an abandoned kitten, and names it after the robot hero to convince his family to keep it. But after a strange encounter with aliens honeymooning on Earth, Tsugio's shocked to find his cat can speak-- and has all of Astro Boy's powers! Sworn to secrecy, Tsugio and Earth's tiniest hero find themselves entangled with demonic cats, pirate ghosts, a crime syndicate, and more!

Source: OpenLibrary