How heavy are the dumbbells you lift?

Hibiki Sakura, a high schooler known for her voracious appetite, is confronted by her friend Ayaka Uehara about her expanding waistline during a typical after-school gathering. In an attempt to get in shape, Hibiki joins the newly opened Silverman Gym, where she meets student council president Akemi Souryuuin. However, things take an unexpected turn when Hibiki discovers that Akemi has a strong interest in muscular physiques. This revelation leads Hibiki to enroll in the gym's program under trainer Naruzou Machio.