Any manga where the male and female leads are childhood friends, but she likes and/or dates someone else. Eventually the male lead wins her over.

Higanjima, with the caveat that the female character isn't really an FL (none of the female characters are all that important in the story) and that I haven't finished the sequel series so I don't know if it will turn into a real relationship.

And Hone ga Kusaru Made, sort of...