妹☆ちゅーちゅー!!

Mamiko, my younger sister, is a huge fan of foreign films, TV dramas, and American culture. For Mamiko, an open-minded and frank American family is the ideal. "Good morning," "Have a great day," "Welcome home," "Good night"... She always tries to kiss me at every opportunity, making me flustered.

But one day, a movie becomes the catalyst, and Mamiko and I find ourselves heading towards a more intense direction in our relationship... What will become of us from now on...?

[from DLSite]