The Barefoot Princess

(from ebookjapan):
Cute and fashionable Margaret is a princess of the Moon Star Kingdom, a small country somewhere on earth. Margaret and her father, Dowager Prince Charleston, a biologist devoted to the study of Daphnia, are good friends, but her grandmother, Empress Dowager Andante, is trying to rebuild her impoverished kingdom by arranging marriage with rich women one after another. The only person Papa loves is his deceased mother. ...... But this time the matchmaker, Miss Pinky, the Duke's daughter, is more aggressive than he expected! Margaret is happy to accept her father's assignment to break up the blind date and accompany him to Japan, but she doesn't seem to get along with the beautiful, rich, but child-hating Miss Pinky at all. However, she does not seem to get along at all with Miss Pinky, who is beautiful, rich, and hates children. After arriving in Japan, Margaret gets involved in an incident involving a magazine reporter, Sankuro Tsubaki!