Giant Step is a shounen, sports comedy. With it's relation to Prince of Tennis being in some of the art of attacks and their relation to tennis. If you have already read Prince of Tennis or even a little bit of it and it was too serious for you then Giant Step would be good to check out.

*I want to pitch to that mitt, just one more time…* When Eijun Sawamura was just fifteen, he met someone who changed the course of his life forever—the catcher Kazuya Miyuki. Now, he's said goodbye to family and friends to travel to Seido High, where he can test his baseball skills alongside some of the best in the nation! (Source: K MANGA)

Eijun Sawamura had his heart set on the middle-school national baseball championships. But his team is eliminated thanks to a wild pitch thrown by Eijun himself. He’s planning to go to high school with his teammates and try again next year when he’s scouted by the famous Seido High School baseball team. When he goes for a campus visit, he finds himself on the receiving end of a baptism by fire! His experience forming a battery with up-and-coming catcher Miyuki rekindles his passion for baseball!! (Source: Kodansha USA) *Note: Includes six extra chapters.*

A warm comedy spinoff series from Ace of the Diamond (aka Daiya no A) written by Yuki Okada, the wife of Yuji Terajima himself. Sawamura and his fellow residents of room 5... accidentally adopted a cat? What will they do about meals? How will they bathe him? Worst of all, pets are prohibited from being kept in the dorms. Sawamura and his roommates struggle to overcome these challenges while keeping their new feline friend a secret. Still, they persevere, because who can resist the cuteness of cats? Read Daiya no C to follow the adventures of the Seidou team and their new furry addition.

One final match to determine who will represent East Tokyo! (Source: Twitter, translated)

Side story of Diamond no Ace that was collected in Diamond no Ace: Guide Book - Ura.

Side story of Diamond no Ace included in Diamond no Ace: Guide Book - Omote.

Raichi lives under the bridge with his father, Raizou. Because they're poor, Raichi took a part-time job as a newspaper delivery boy every morning.

One final match to determine who will represent East Tokyo! Source: Translated from Twitter