Shouta Kikuzato’s hopes of starting on his school’s prestigious soccer team are derailed when a terrible incident costs him his leg. Now in his first year of high school (again), Kikuzato has resigned himself to never reaching his athletic dreams. But when Chidori, a passing prosthetist, notices Kikuzato’s artificial limb- and speed-as he races through the train station, the specialist proposes a Chidori will build Kikuzato a brand-new leg designed solely for speed. All Kikuzato has to do is run!

After obtaining an artificial leg built for sport from Chidori the shady prosthetist, Kikuzato resolved to become a para-athlete. To strengthen his body so he can run again, Kikuzato wants to join the track-and-field club, but it’s not so easy: His former soccer club friends have lost interest in him, his new clubmates don't know how to approach him, and his overprotective mother won’t let him join any new clubs! With no easy ways to get faster, is the solution...to challenge everyone to a match?!

Kikuzato is sprinting toward his new goal of becoming a more powerful runner, but each stride takes him further from his soccer days—and the friends who once played alongside him. Kikuzato’s wasn’t the only life affected by his accident, and ever since that day, Takekawa has watched his best friend on and off the field steadily slip away. Can these former teammates repair the rift between them, even as world events throw all their high school hopes and dreams into disarray?

Kikuzato, a high-schooler with a prosthetic leg, continues his dreams of being a para-athlete. Even in the face of the COVID-19 pandemic and arguments with his father, Kikuzato stands proud at the start line for his first competition.

As schools reopen and clubs reconvene after COVID-19 closures, Kikuzato is eager to try out his new leg. But even with the improved fit, his worry about falling like he did in his first public race plagues his training for the next. Running is as much a mental game as it is a physical one, and between his fear and his fight with Take, Kikuzato isn’t seeing the improvement he hoped his new leg would bring. If he means to succeed, Kikuzato must answer one question for “Why am I running anyway?”