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The female protagonist learned that her sister's death was not an accident. The boxing gym where her sister had punched before her death was actually a mafia and evil organization. Therefore, the female protagonist came to this gym with a revenge plan. At first, the female protagonist could still have the upper hand, after all, with one against three, her physical strength gradually exhausted. Despite holding a strong desire for revenge and a firm willpower, she was eventually knocked unconscious by the three of them.