Mashiro Shiina is a manga character and is called the Pet Girl of Sakarasou. The character is a world renowned artist who has moved to the area for a change of scenery. People who watch the show see that she is very talented, but they also see that she is very awkward around other people. She likes to stay by herself and not be bothered by outsiders. Because of this fans of the show believe that Mashiro is probably autistic to some degree. She is also considered something of an artistic savant which lends credence to the claim. Who knows?