I am in love with my sister Premium Edition [First time limited specification]

Product description ※Please note that product information is not in full comprehensive meaning because of the machine translation.

6 million copies of the big hit comic depicting the theme of the shock make it a long-awaited movie! A love story that delicately and purely spells the shocking theme of twin brother-sister's love affair.
Ko and Iku of twin brothers sister are high school third grade. I was a good friend from a young age, but as soon as I had puberty, my buddies became cold. But, it is inside out affection. The trust that I learned that there is a man who thinks of Iku will unbearable, confess to Iku. Two older brothers and sisters who can not stop their feelings toward each other. However, a girl of a classmate who can reassure his trust has seen the two kisses .... Fans must watch the bonus footage packed with 2 sets of premium edition!