Densuke
Densuke Mifune is a shy 15 year old boy. Before he joined the Eiken club, he was shy and didn't have many friends except for Shimada and Todoroki; but when he encountered Chiharu (he fell on her breasts) a purple haired girl called Kirika forced him to join Eiken club. From then on, he was a member of the club and went on some (mostly perverted) "adventures".
Densuke is a fairly common stereotype of the male lead in a ecchi/harem genre series. He is the weak and untalented boy who people tend to forget even if there's only minutes between encounters, he somehow becomes the love interest of one or more girl's who are usually the most beautiful and popular girl's at school. Densuke follows this stereotype very well.
Densuke is always getting into situation's through out the manga and the Oav that end up with him in a compromising position with one or more of the girls. Either by accidents or through deliberate acts done by the girls who are either teasing him (Kirika) or who genuinely want his affection.
His main goal is to try and have a proper relationship with Chiharu. This often backfires as he quite often finds himself through little fault of his own between the girls breasts. It is however quite obvious through the series that she feels the same way about him and also wishes a relationship, but is put off by his apparent acts of perversion that she always manages to catch him in the middle of doing.
In the OAV he is voiced by Akeno Watanabe in japanese and Bryce Papenbrook in english