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Teru is a cocky young boxer living together with Ben, an autistic young man who's been like a little brother to him ever since his mother abandoned him. When Teru loses a match against Kitazawa, a serious opponent from Osaka, he has to quit boxing because of a vision injury. Ben, who idolizes Teru and is obsessed with how "Teru can't lose", attempts to walk to Osaka to have a rematch with Kitazawa in place of him. Teru and Aoyama, a boxer who once lost to Teru, end up going on a road trip to Osaka to resolve Ben's obsession. Stopping at various gyms on the way, they realize that Ben's obsessive imitating of Teru might make him a real boxer.