Papa to♥Series

Mira Munakata is a 15-year-old boy who is just entering highs school. The good news is that it's the school he tried so hard to get enrolled in along with his best friend Kazuki! The bad news? Mira is in an illicit love affair with his adoptive Hollywood-star father Kyousuke!

The [in]famous light novel that spawned the popular OVA. Written by Ken Nanbara and illustrated by Sae Momoki.

(Source: Hakusensha's PTKITD Fan Site)