The sky outside the window was dimly lit, and through the glass, one could see the faint grey mist outside. The air was surprisingly cool in the early morning.
"Hoo..." In the gloomy bedroom, a boy dressed in a black tank top stood silently in front of the window with his eyes tightly shut. His lips were slightly parted, and the thin sound of his breathing continued steadily for almost twenty seconds.
It wasn't until he had exhaled all the air from his lungs that he slowly inhaled fresh air. The boy had an ordinary face with decent features, but the solid outline of his body already hinted at his excellent physical condition. Particularly his arms were strong, almost a circle thicker than those of other boys his age. Even boys who played basketball regularly couldn't compare.
