SPOILER:
Kevin is still upset about Yellow's behavior. But although being offended by how he reacted, and still thinking what she did was fine, Yellow still descides to keep trying to make ammends, seeing as hurting KEvin was something she didn't want to do. but he keeps ignoring her, and very rudely. at class she writes him a note with her feelings and thoughts on the subject, and he just crumples it up and throws it away. That's when Yellow descides enough is enough. She feels that she doens't have tot ake this from Kevina nymore, she tried to be nice but he jsut hurt her back. Coincidentally, as KEvin come sback home and looks in the mirror hes uddenly realizes that he's just putting up a facade. he knows he still loves yellow and he still wants her back. suddenly Kevin's inner self appears on his shoulder(With spiffy sunglasses, if I may say) and tells him to get a clue. And so tomorrow at school he tries to apologize about the way he reacted, but she refuses to lsiten. at some point she almost breaks, but at the last seconds she snaps back to her wits and tells Kevin to, basically, get a Clue. Kevin keeps trying but the response is always the same.
At some point Kevin uses Yellow's own words in a poem directed at her, which he hangs up on the bulletin board at school. Telling Yellow to get a clue, and see how much he loves her. But before he can get any feedback he comes across a poster to a show of The Morphing Potiopns - Yellow's band. And it just about started! He runs over to the concert as the band rocks the house. wehn he gets there the ickets are alls old out, and so he runs over to the backstage entrance, says something to the guard and suddenly distracts him with a simple trick. the guard looks away as Kevin sneaks into the building, but as the guard realizes he'd been tricked, he runs after Kevin only to get hit by the door that closed behind him.
Kevins runs around, not even sure what he's looking for, when suddenly he sees a guitar lying by the wall. His inner self appears again, and they both agree on what Kevin has to do.
Kevin slides onstage rocking onm his guitar and taking everbody by surprise, singing his song "Get A clue", Yellow, shocke dby the entire ordeal, quickly improvises and sings along, as though it's all planned. the band joins in andthe crowd goes wild for Kevin, at some point Yellow can't withstand it anymore and storms off the stage.