While the world of Diamond no Ace is the primary setting, the author has incorporated character designs and plots from several manga and anime, including "Ace of Diamond no Ace," "Amnesiac Pitcher," and "The Merits and Sins of Diamond no Ou." The author's limited baseball knowledge comes from these manga, and the content is largely personal, so please bear with me if there are any flaws.

What changes will it bring to Seidou when the best pitcher of the generation joins the team? Can the regrets of the third grade be made up?

The author is not good at writing introductions. If you are interested, please read the main text.