The story is set at the bowling club of Ikkokukan High School in Nagano Prefecture.
Mai, the club captain, values having fun with everyone over winning. But her junior, Rina, pushes back, saying, “I want to win.”
When Rina threatens to quit the club, Mai tries to talk her down—but Rina challenges her to a one-game match.
Suddenly, the bowling ball begins to glow, and the five club members are enveloped in a mysterious light…

When they wake up—
They’ve somehow time traveled to the Sengoku era!?

[Source: Anime PONY CANYON]