I am not following manga and don't remember anime well - which guy confessed to Tomoko??? or is she delusional?
In the ova episode there was a guy who fell in love Tomoko. I don't remember but I believe he confessed to her or probably didn't since the door to the roof was locked. He was an underclassmen that was friends with her brother.
He definitely wasn't in love with Tomoko. He just thought she gave off some cool anime vibe and was just interested cuz he's an otaku that wants something anime-ish to happen to him.