Rival Lefty

(from ebookjapan):

A passionate baseball manga by the master of the manga world, Jiro TSUNODA!　

The theme of this work is "baseball", and it depicts the importance of having rivals who support and encourage us to strive and grow as human beings!　

Yashiro is a boy who never neglects his efforts to win in everything, including sports, fights, and studies.

When he sees Todoroki, a man who is very active in youth baseball, he declares himself a one-sided rival. At first, Todoroki does not take him seriously, but he is gradually taken in by Yashiro's pace...!　

Volume 1 shows Yashiro in the throes of misfortune and adversity!