Katagiri Karma has always lived in the background, happily avoiding attention and drama. High school, in his mind, was supposed to be just another quiet chapter in a peaceful, uneventful life titled the Invisible Man.
That plan shatters the day he accidentally walks into an empty classroom—only to find Tachibana Yuukari, a picture-perfect honor student, in the middle of changing. But instead of panicking or reporting him, Tachibana makes an unexpected move: she blackmails him into pretending to be her boyfriend.
What starts as a bizarre and uncomfortable agreement quickly spirals out of control, dragging Katagiri into a tangled mess of rumors, manipulation, and scenarios far beyond anything he ever wanted. Peace was never an option.