25-year old Yuka Orihara is a lovely and cheerful woman, but she was born with a lower IQ than average. She grew up with lots of love of her parents, so she has become a good-natured girl. However, she cannot control her feelings very well, and sometimes she does something too wild, which concerns people around her. While her intellectual ability is low, she has an amazing sense in arts. She has been drawing artistic paintings, and creating unique objects which reflect her pure heart. Her mother always watches her with love and even her late father, who was also a painter, still influences her. Besides, she has a good friend; Ryo Kanzaki. He is her cousin and like a brother to her. But Yuka's peaceful life suddenly changes when her work gets a prize at a competition to which Ryo has entered her work secretly. She is forced to come out of her small world to an unknown world. And she meets a man; Toru Sawatari, a reporter for a photo-magazine. He used to be a journalist of a newspaper, but was demoted to an associate company a few years ago. But he is determined to return to the paper as he hates the owner. Toru, who is very cool and has a past, starts having a business relationship with Yuka. He does not care about her retardation and treats her as an ordinary person. This comes from his indifference, but as Yuka believes he is a 'nice' person, he gets attracted to her purity...