Oshirikko Venus

The hero, Kanji Toyama is an ordinary boy with one exception.
His eyes being able to see small subtle movement that most don't see. But mostly uses his gift to see outline of people's butt mostly those of girls. His fetish for butts awaken after seeing statue of Venus in person as a child. Despite this gift and love for butts he lived a normal life, until one day he found an unrivaled butt ....