Pachi-Slot Sengen), the series revolves around titular character Rio Rollins, a popular casino dealer working at the Howard Resort who is known as the "Goddess of Victory", and the thirteen cards called Gates which are used to determine the world's most skilled dealer.

Mint Clark, a young child, comes to the Howard Resort with her grandfather and encounters Rio, and the two become the best of friends.

by the Love Roulettes, consisting of Marina Inoue (Rio), Ayana Taketatsu (Mint), Chiaki Takahashi (Rina), and Yōko Hikasa (Linda), while the ending theme is "Miracle☆Chance" (みらくる☆ちゃんす, Mirakuru Chansu) by ULTRA-PRISM.

[6] The anime was licensed in North America by Media Blasters in 2013 and released on DVD, in Japanese with English subtitles, on March 25, 2014.

[9] The series premiered on Toku in the United States as the first program to air on the network at the time of its launch on December 31, 2015.