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.

Young Mabel West is the daughter of mystery writer Raymond West, who wants her to lead a normal life. Rebelling against this, Mabel wants to be a great detective, and sets out for London to become assistant to none other than Hercule Poirot, the great Belgian detective who resides there. She finally wins the reluctant approval of her father, and embarks on an exciting life of mystery and suspense - his only demand being that she occasionally spend some time with her great-aunt, Jane Marple, in the small village of St. Mary Mead.

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.