Hibiki decides to weight-train to be absolutely thin by summer vacation.

12 of 162 Mets games this season on Fubo

135 of 162 Yankees games this season on Fubo
Dismayed by a recent weight gain, first-year high school student and snack-lover Hibiki Sakura joins the Silverman Gym and decides to try weight-training after meeting the handsome trainer Naruzo Machio.
Machio explains why exercise causes one to gain both weight and muscle, Akemi teaches the importance of dynamic stretching, and Hibiki learns about Ayaka's family business.
One of Hibiki's teachers, Satomi Tachibana, joins the Silverman Gym to lose some weight, but wants to hide her secret hobby from her students; Ayaka meets Hibiki and Akemi for lunch, and notices that something about Hibiki's bento feels strange.
Hibiki and Akemi must use different equipment due to crowds at the gym; Ayaka joins them in a home training session; everyone goes to the beach.