Kobato is a girl who came to earth to fulfill her wish, which is to go to a certain place. To fulfill that wish, she has to find a bottle and fill it with scarred hearts. Together with her “teacher”, which is a stuffed animal, she search for the scarred hearts. However she may not fall in love with any person whom she cures the heart of.Kobato is a sweet and perky girl, but also extremely naive about the world around her, since she literally fell out of the sky, and thus unaccustomed to the human world. She is on a mission to fill a mysterious flask withheart fragments gained by healing broken hearts. Once filled, her wish to visit a certain place will be granted. However, she must not fall in love with a particular boy she works with and whose heart she must heal.