After heroically saving a fantasy realm, a man finds himself overwhelmed by fame, embracing the life of an isekai enthusiast. His journey takes a sudden turn when he falls into a trap, sending him back to his original world, but as a helpless infant. Now, this former hero must navigate the challenges of growing up again as a melancholy high school student. Just when he thinks he’s settled into a mundane existence, fate intervenes, pulling him back to the very world he once saved for a second time, promising more unexpected adventures ahead.