Please Stop Asking Me to Be a Superhero

With a steel-like muscular physique, the speed surpassing the light, and the immeasurable strength, this superhero, who shines the world like light and has single-handedly saved humanity, suddenly disappeared from the public in a day three years later. What is the reason behind this? Protagonist: Darn it... I only used one percent of my power, why my chest muscles I worked so hard to regain are turning white and soft! Doctor: Although I don't want to tell you this, if you continue to use your superpowers... I'm afraid your body will transform completely into that of a girl within six months. Original Novel Official English