How Heavy Are the Dumbbells You Lift? Season 1 Episode 3 Sensei's on a Diet, Too? ( Air Date 2019-07-17 ) Genre Animation, Comedy category. Overview "Satomi Tachibana, one of Hibiki's teachers, comes to Silverman Gym to lose some weight. Can she hide her secret hobby from her students? Ayaka joins Hibiki and Akemi for lunch, and notices that something about Hibiki's bento feels off…".