Extra C is Secretly Overpowered Novel

Upon discovering the truth a year ago, I realized I'd been reincarnated into the very world of a Romantic Comedy novel—and I was trapped as Extra C. This character existed only as a forgettable side figure, randomly appearing in moments of no consequence before vanishing into obscurity. The Main Characters moved through their stories completely unaware of my existence. As High School approached just one year later, my role as Extra C felt irreversibly sealed. But nothing could have prepared me for what I was actually becoming...