Hitotsuya Yuu dreams of becoming a world-class boxer. He searches for a gym to hone his skills, first encountering a dilapidated one he helps save from creditors. Despite the proprietor's warning, Yuu's path soon crosses with Akagi Tetsu, an ex-champion boxer from that same old gym. Yuu demonstrates incredible raw talent and determination at a new gym. However, an event on TV reveals a world-famous boxing trainer known as "the Kaiser," whose full nickname is "Kaiser Hitotsuya." This news ignites an overwhelming rage within Yuu, hinting at a deeper connection to the trainer.
