"Cinderella Boy" is a 12-episode anime series that blends elements of action, comedy, and romance, set in a world where organized crime and gambling intersect. The story centers around Ranma, a young man who leads a double life. By day, he is a timid and unassuming high school student, but by night, he transforms into a confident and skilled gambler known as "Cinderella." This alter ego is a result of a mysterious curse that causes Ranma to switch genders at midnight, turning into a beautiful woman. The curse is tied to a magical pocket watch, which also grants Ranma extraordinary luck and gambling prowess.

The narrative unfolds as Ranma becomes entangled with the Midas Bank, a powerful and shadowy organization that controls the underground gambling world. The bank enforces its rules through deadly games, where participants risk their lives for immense wealth. Ranma, as Cinderella, is drawn into this dangerous world after encountering a mysterious girl named Shiori, who is connected to the Midas Bank. Shiori becomes a key figure in Ranma's life, as her past and motivations are gradually revealed to be intertwined with the bank's operations.

Throughout the series, Ranma faces off against various opponents in high-stakes gambling matches, each with their own unique skills and strategies. These encounters are not only tests of luck and wit but also opportunities for Ranma to uncover more about the curse and the true nature of the Midas Bank. The series explores themes of identity, fate, and the consequences of greed, as Ranma navigates the dual challenges of his personal life and the perilous world of underground gambling.

The main characters include Ranma, whose dual identity drives much of the plot; Shiori, whose connection to the Midas Bank adds layers of intrigue; and a cast of supporting characters, including rival gamblers and members of the Midas Bank, who each play a role in the unfolding drama. The series balances its darker themes with moments of humor and lightheartedness, particularly in Ranma's interactions with his classmates and the comedic situations arising from his gender-switching curse.

Overall, "Cinderella Boy" presents a unique premise with its blend of gambling, action, and supernatural elements, offering a mix of suspense and character-driven storytelling. The series maintains a steady pace, with each episode contributing to the overarching narrative while also providing self-contained gambling challenges that keep the plot engaging.