Cinderella Nine was apparently a mobile game (which I can't find so I suppose it died) which spawned this 12-episode anime series about a group of girls in a mostly female high school (though I think they only show male students once when they mention it used to be an all female-high school so boys are new) who decided to form a hardball baseball club.

Tsubasa (Nozomi Nishida) is the leader. She played in a mostly boys team and they won the junior league Japanese championship last summer. Now she just wants to play more baseball so is willing to start a new club in that pursuit.

Tomoe ( (Honoka Inoue) is Tusabasa's best friend who joins the team but has little skill. Eventually there is a dramatic showdown because Tsubasa doesn't push her best friend to be the best she can be.

Ryō (Reina Kondō) wants to be a pro hardball player and her team lost to Tsubasa's team in the championship. At first hostile to Tsubasa but is won over because Tsubasa is genuinely enthusiastic and supportive of everyone on the team.

Yūki (Saki Minami) tall shy girl who joins the team with Akane (Yumiri Hanamori), a short shy girl. They kind of go in opposite trajectories because turns out Yūki has a good left-handed pitch but Akane try as she might is only a middling outfielder and gets relegated to backup.

There are other girls who join the team as the series progresses, mostly unfamiliar with hardball but willing to try it out. There are three games depicted: an exhibition match with another relatively new-to-hardball school but with more experienced players, another exhibition match against the top school's third stringers, and then to the national tournament where they play the first school in a rematch for real this time.

The hardball play is good, showing off strategies. The characters are good and it's all wholesome. Animation is pretty good too. This series reminds me of Princess Nine which I also loved.