Ayumu is a hardworking yet timid kid who is constantly being bullied. After one day of being bullied, he finds himself being punched into the air... and waking up in a boxing gym!

Thus, Ayumu's quest to become "just a little bit" stronger begins with the two wacky members of the Gold Boxing Gym. Will Ayumu finally stand up for himself or will his timidness get the better of him?