Dismayed by her recent weight gain, high school girl and food lover Hibiki Sakura joins Silverman Gym. The hordes of muscle men at the gym are intimidating, but Hibiki gives strength training a try after meeting the handsome trainer Machio Naruzo.

Machio explains why exercising causes you to gain both weight and muscle, and describes how to do a lat pulldown. Akemi lectures on the importance of dynamic stretching. Hibiki learns about Ayaka's family business.