Angel's Egg

Shota has a thing for beautiful girls. Though he has a girlfriend, he just can't get his mind off of the lovely women he saw on the train. Sometime later he goes to visit his father in the hospital . . . Where he meets the train girl again, and this time she's in charge of his father. He talks to the girl, only to discover that not only is she eight years older than him, she's also the sister of his current girlfriend! (official distributor synopsis)