Mashiro Shiina is the love interest of Sorata Kanda in The Pet Girl of Sakurasou and the titular "pet girl". She is a world famous artist who transferred into Suiko as a second-year to learn how to draw manga. Although her artworks are widely admired by the world in spite of her young age, she knows nothing other than drawing, and has an extreme lack of common sense and living ability. Due to this, Sorata has been forced to handle Mashiro's living chores, to the point that he even has to pick out underwear for her, or she will go out without them. Mashiro indirectly inspires Sorata to become a game designer. Throughout the series, their relationship becomes rocky at times due to Sorata becoming resentful and jealous of Mashiro's talent and success, but in the end they never stop loving each other.