Ushiro Keisuke
When he was in elementary school, he belonged to the dodgeball club. He ​belonged ​to the track and field club at Oasa Higashimachi Junior High School, engaged in hurdle running in the first grade, 100m, push out and high jump in the second grade. He grew from  in first year to  in second year and  in third year. He was unable to practice as much as he could because of Osgood’s, which induces knee pain. However, his height later became a very strong weapon in competing within the world. After entering high school, Osgood’s disease was completely cured, and he started the octathlon with the recommendation of the track and field manager. He finished second in the final inter high school competition.