Keiko Himuro, Chairman of the Kisuragi School, puts together an all-girl baseball team led by Ryo Hayakawa, daughter of a legendary pitcher, in hopes of proving that girls can compete just as well as boys. Their goal: Koshien stadium, where only the best teams get the opportunity to play.

Miyu, a vampire girl, acts as a guardian, sending stray demons known as Shinma back to the darkness while publicly posing as a high school student.