Rio: Rainbow Gate! Season 1 Episode 12 Speculation

Rio vs. Rina-the battle of the century rapidly approaches. At Howard's suggestion, Rio and her friends visit a beautiful resort on the coast. While her friends enjoy themselves in the hot springs playing ping pong, Rio heads by herself to a summer home outside the town where she once spent time with Rina and her mother. As the pleasant memories come back to life in her mind, an surprising figure watches her.