The protagonist finds himself hijacking the body of a beautiful office lady he coincidentally meets on a train, restarting his life from zero. Using the mystical grimoire "Possession for Dummies," he possesses her body and begins living an entirely new existence. The story unfolds with intense desire: masturbating in the restroom, slippery lesbian massage sessions through alternating possession, and even conspiring with male coworkers via joint possession. Set in a lingerie manufacturing company, this gender-bending fantasy follows the protagonist as he gradually loses his original sense of self, immersing fully into his host's life. As his mind transforms and his cravings deepen, the ultimate truth lurking beyond his desires is finally revealed.