Ren is a fifteen-year-old boy who is self-conscious about his small stature. Mistreated by his peers, he feels powerless in their presence and bottles up his anger every day. However, fate leads this high school student to discover an art that will unleash his hidden talent: judo. Ren embarks on "the path of flexibility" with unwavering enthusiasm and tenacity, which will be the keys to his ascent!