ぼくの巫女は小さな恋妹～寵愛～

Hikaru is living in a dormitory being apart from his family. He doesn't visit his house because he had an affair with his brother's wife, Kiriko and he doesn't want to meet his brother. One day, his brother and Kiriko had an accident and passed away...
He adopted Shion, who left alone, and comes back to his house. Days to raise Shion as an older brother... Arranged fiancee, Tomoyo. Maid working at his house, Kaori. Shion's senior at school, Midori. Is Hikaru going to choose Shion at the end of his love road? How is Shion growing up, Miko or his bride?