Maria Momoe (Age 23) serves as Nishiura's head baseball coach, becoming the most prominent adult figure associated with the team. A Nishiura graduate from when the school offered softball rather than baseball, she earns the nickname "Momokan" from players who respect yet find her intimidating. Known for her physical strength and dedication, she works additional jobs to fund team equipment. Despite initial skepticism about a female baseball coach, she demonstrates clear competence in the role. Her small dog Ai regularly attends team practices and games.

But Also Her manner and her beauty in crush did opposite sex and even it adultery can her life after quit from her Team as alone in the good housekeeping and training at work her construction worker in after manga as known ex-coacher.

Big Windup! was Serialized in Manga on Afternoon Seinen Magazine by Kodansha.