Amagami SS: Sister

In this fun, light-hearted Special episode, Miya Tachibana attempts to figure out why her weird and slightly perverted older brother (Junichi) has such a friendly relationship with many of the girls in his school, yet can't manage to find himself a girlfriend. Fearing he might become a bum later in life and lose his job, she decides to stalk him to find out if there's more to him than what she see...