In a world where superheroes are common, a young hero-in-training, Izuku Midoriya, discovers his body's newfound, unexpected response to the heroes he admires. His quirk, One For All, awakens with a vengeance, manifesting in an embarrassingly visible manner during training. When his mentor, All Might, notices, he guides Izuku through the confusing, pleasurable new sensations, helping him control his power while exploring his body's limits.