The strongest underground fighter, Princess Burst Yūki (Sakura Yūki), is also a hardworking woman who supports the family (like family) she grew up with at the orphanage with her fight money. A scout from the industry legend known as 'King' came to her. For the sake of her orphanage family (like family), and most of all, to reach the top herself, Yūki faces King in a match. But, however… "You set me up." The true nature of the match with King was a show where the loser would be violently assaulted by King in front of a large audience as a penalty. With a contorted face of regret, she was forced to take his penis in her mouth, and incredibly, her virginity was taken in front of everyone. Furthermore, Yūki is stunned by King's true intentions. No rules, anything goes underground fighting. Due to the lewd penalty imposed on the loser, Princess Burst Yūki's mature body is stained white in front of a large audience…