Dynamite♥Milk♥Pie

From Stage Storm:

Seiko and Kanako are the daughters of two important companies. Nijihiko, the son of another company must choose a wife between them, but Kanako is kidnapped. Miruku is a happy girl, crazy for cakes and pies, and really good at kendo. She looks like the missing girl so she's asked to substitute her to meet Nijihiko.