Jinsei Gyakuten: Uwakisare, Enzai wo Kiserareta Orega, Gakuenichi no Bishoujo ni Natsukareru

The day he lost everything was the day he met her. At the end of summer, Eiji Aono witnesses the unthinkable: his childhood friend and girlfriend, Miyuki Amada, cheating on him with Kondo, the ace of the school's soccer team. Betrayed by the girl he loved, Eiji is left emotionally shattered. As if that weren't enough, he soon becomes the target of vicious rumors and relentless slander for crimes he never committed. With nowhere left to turn, he flees to the rooftop of his school...there, at his lowest point, he meets a mysterious girl who will change his life forever.

(Source: One Peace Books)