Kuroi Himitsu Heiki

A scout rushed to call Mihara-san, the manager of the Oyo Whales, in the middle of the night. He had to tell him that the Yomiuri Giants have discovered a top-secret weapon. The secret weapon was... a young pitcher! When coach Mihara saw the film of the pitcher in action, he looked up to heavens. Is there any batter who can hit this ball…? The secret weapon showed up the next day at Korakuen Stadium. His name is Rintaro Tsubaki, and he wears number 11! This is a passionate, bloodthirsty, over-the-stop story about professional baseball, where the heroes have superhuman abilities!

(Source: Manga Z, translated)