That Cute Kid is Mine and Mine(2003)

Boku to Ore no Kawaii Anoko

Elite businessmen Hosokawa and graduate student Takagi are both in love with cute little Gouda, who they used to go to school with! Gouda, however, is a little thick and only sees the two as good friends. One of them is his beloved childhood friend, and the other is his bosom buddy. But then, one day, Gouda falls in love...

(Source: DMG)