Yuki no Taiyou

Yuki is a 10-year old girl living in an orphanage, until she is adopted by Mr. and Mrs. Iwabuchi. Yuki's new stepsister Sanae is a nice girl who has a heart disease.Mr. Iwabuchi runs a construction company and he is planning to build a research center in Hokkaido. When Mr. Iwabuhi and Yuki get lost in the snow, Ryuuta saves them. Ryuuta is Ainu and thinks that mainland Japanese people are invading Hokkaido and he hates it.