Mikan Nono, a 15-year-old girl, arrives at a summer house full of male brothers! ! Mikan, who rode a horse for three days to the Natsu family, is covered in mud. However, Mikan took a bath, and when she was clean, she was a very cute girl. She is completely ignorant of civilization, and the people of the Natsu family are surprised by the free-spirited Mikan. Will Mikan be able to live in the big city??