Shikishima Industries, run by Prof. Shikishima in Japan after WWII, has become a dominant tech company that focuses on building robots. Nevertheless, the company's triumph was built on the foundation of a heinous secret from the war, which resulted in the demise of Prof. Kaneda, Prof. Shikishima's mentor. Shoutarou, the son of Prof. Kaneda, is on the verge of uncovering the truth, and it will transform him irrevocably.