Manami Ota, a female boxer, had a happy marriage, but she lost her husband Hitoshi Ota from an illness. Now Manami is raising her 5-year-old daughter, Emi, as a single mother. However, life does not go well as a single mother. Yoko Ota, a mother-in-law who is worried about Emi's future, decides to dispute Emi's child support rights with Manami in court. Emi is the only "light of hope" for Manami who is trying to rise from the sadness of losing her husband. Taking Emi is equivalent to death for Manami. Yuka Tanigawa, a childhood friend, defends her as a lawyer, but Manami, who has only a part-time job and can't earn livings expenses, is becoming more and more disadvantaged in court. Meanwhile, the work of a care helper that she finally found with her thoughts. One day, when she was sexually harassed by an old man, Tsukuda, Manami accidentally hit him and was put in the detention center. In this case, the child support right was completely transferred to Yoko, and Emi went to kindergarten from the house of Yoko. Manami is cornered. She determined to become a champion to regain Emi. Withstand hard practice with her trainer Tanikawa she gradually is able to have confidence as a boxer. "If I become a champion within half a year, I bring Emi back to me. Manami declares to Yoko. Manami wants to be stronger now and continues to spend every day enduring hard training. A match with Aya Shiratori, a fast-rising star in the women's boxing world, is coming. Manami takes this opportunity and accepts the match in order to move quickly to the next step. The match was a fierce battle, but Manami wins. The battle of this match was highly evaluated, and finally the match with champion Natsumi Serizawa came in. However, Manami's right fist and right arm screamed in the match against Aya Shiratori. The doctor tells her that if she overdoes it, she will not be able to use her right arm for the rest of her life. "If I win this match, Emi will be back." With that in mind, Manami now had no choice but to go up to the ring to regain Emi. And half a year of the promise with Yoko is approaching, she can't go back anymore. Tanikawa notices Manami's anomaly, but Manami's will is strong. On the contrary, he had to support her. And the fateful world championship. Manami stands in the ring of a boxing match for all of herself.