This is a story based on "Ace of Diamonds". In order to prevent the summer of the seniors in the original work from regretting, and to give the seniors in the "bad year" a chance to realize their dreams of Koshien, a "genius pitcher" who was the same generation as Miyuki was parachuted in.
Hayami Tatsuya, a pitcher who considered himself a "hard-working mortal" in junior high school, entered a powerful baseball school called "Seido" with doubts about his own ability and complicated emotions about baseball.
Here, he met like-minded partners and encountered unprecedented challenges. Under the guidance of the talented catcher Kazuya Miyuki, and in the process of rigorous training, how will he tear off his self-imposed label, truly awaken his talent, and work with the team to launch the most ardent impact towards the common goal - the goal of Koshien, national championship?
