Chapter 5

Plank is the fifth chapter of Volume 1 of the manga Dumbbell Nan-Kilo Moteru?

Summary
"The Seven comman dos 4 : The great escape of fury" was released which Hibiki and Ayaka are big fans of the show. Ayaka invites Hibiki to go to her house after school to watch the new film. (We learn that Hibki and Ayaka have been friends since the first day of high school.)

Nana her older sister asks for her. As the Uehara family run a boxing gym called " Glory Boxing Gym" which is just behind their house. Her father was a professional boxer who retired and created his own boxing gym and that is the reason why she has such a physique from boxing.