Atom The Beginning Vol 2

Atom: The Beginning by Tetsuro Kasahara. A Sci-Fi manga rated Teen, published in English by Titan Manga.

Years before Astro Boy, two brilliant young scientists, Umataro Tenma and Hiroshi Ochanomizu, build an experimental robot called A106, nicknamed Six, who begins to show signs of something like a heart. A prequel to Osamu Tezuka's classic Astro Boy.