Kojirou Kageyama (影山小次郎) is Eiichiro Maruo's friend at Oosugi High School, and is one of the first characters to appear in the manga. He attends most of Ei-Chan's tennis matches and admires Natsu Takasaki, the school idol.
Kageyama has a large triangular nose and is often seen wearing a polo shirt. He has brown hair and a spiky hairstyle.
- Does not like tomato