This manga is based on "My Bullying Diary", an biographical book where Tsuchiya recounts the time when his eldest daughter was a victim of bullying. Part of a project at Weekly Shonen Jump to raise awareness about the bullying issue. (Source: Wikipedia, translated, edited)
Kazuma Yamakawa is the only pitcher to have achieved a no-hitter against Aoba II Junior High School. Kazuma enrolled in Seihou Gakuen to fulfill his promise of a rematch at Koushien with his rival Yuuji Tsukamoto, a genius pitcher from Aoba II Junior High School, but... he learns from Haruka Minamikaze, the manager of the baseball team, that Tsukamoto died in an accident in high school. Having lost sight of his reason for continuing to play baseball, will Kazuma still be able to step on the mound?