Living alone in a huge mansion after the death of his parents, our protagonist gazes outside and sees a cute girl. He thinks to himself that life would be so much better if she was his little sister, a part of his family. He then hears a knock at his door and the girl introduces herself as his little sister.
[From [URL=http://omochikaeri.wordpress.com/2009/11/01/november-2009-eroge-releases/]Hau~ Omochikaeri![/url]]