I decided to become a fake boyfriend with my childhood friend who was dumped by my senior, in order to get revenge on the senior who cuckolded me with my childhood friend.

"Hey Haruto, let's break up." I was dumped by my childhood friend, whom I had started dating at the same time I entered high school. When I heard the details, my childhood friend had been cheating with a senior student and wanted to break up because she was starting to date that senior instead. Thrown to rock bottom, I became like a living corpse in my despair, but gradually that despair transformed into anger. I swore revenge against my childhood friend and the senior student. I approached the senior's ex-girlfriend and proposed that we take revenge together, but she said my revenge plan was too naive... She convinced me that the true form of revenge would be for us—the ones who were abandoned—to appear happy. And so we decided to play fake lovers in order to get under the skin of the senior and my childhood friend...