Ace of the Diamond Vol. 4 (Kodansha, 2017)

Somehow, among the numerous members of the Seido high school baseball team, Eijun has been raised to junior varsity. Aiming even higher, he teams up with the third-year catcher Chris, and works hard to level up! However, the race to make it to varsity has begun to intensify, and he still doesn't know what his selling point is...!