Story is a re-make of the manga with the same title by Abe Miyuki. Basically about the romantic relationship between stepbrothers with a huge age-gap.
I already knew about this story from a friend, who thinks this is cute. I have no idea what she sees in a relationship with such an age-gap, not to speak about the morality. -.-" Well, I shouldn't be surprised, as she likes yaoi like Koisuru Boukun or Sex Pistols... but this is def. not for me.