The manga is based on Akatsuki and Kadokawa’s Hachigatsu no Cinderella Nine smartphone game and is an all-new story centering on a rookie high school baseball player named Asu Suzumura.
Amazon’s listing of the fifth volume of Kōichirō Hoshino’s Hachigatsu no Cinderella Nine S manga lists that the manga will end in that volume.
In the original Hachigatsu no Cinderella Nine game, the player takes the role of an unnamed former little senior league baseball ace who lost their baseball career after suffering an unspecified injury.
In the game, players gather team members (there are over 50 characters in the game) and experience the team members’ stories.