Rio is 25 years old and lives in Osaka. She works as a beer vendor at a baseball stadium. Her big, bright eyes resemble those of announcer Mizuki. Her gentle Kansai accent makes her the type of woman who is a femme fatale that tickles men's hearts. She's good at winning over regulars with just the phrase, "Would you like another drink?" It's no wonder that she gets hit on by the stadium patrons (mostly older men) all the time. And what's more, she sometimes goes along with them...