Juugo Yakyuu Shounen Hyouryuuki

Hakauai Gakusha, a traditional girls' high school, is going co-ed to help increase enrollment. The centerpiece of the recruiting program is a new baseball team, but the famous coach who was hired to build the team suddenly passes away! Now the new coach and the fifteen remaining members of the team are thrown into the fierce competition of high school baseball! A new baseball team's search for victory begins!

(Source: Sunday Webry, translated)