i think it started off with two people on a hill, one guy says to his more athletic friend that he likes this chick. but the guy takes too long to make a move on the chick so his athletic friend hooks up with her in hopes that the one guy will challenge him for the girl. but he never does until the athletic friend is framed for setting up a meeting for some dudes to molest the chick.
i have no clue what manga this is from. i know that i read it before. i thought it was i"s but then i reread that and it wasnt.