イース6 オンライン is a role-playing game developed by RESTAR LIMITED HK and licensed for Android. It is a mobile online RPG that brings the popular Ys series by Nihon Falcom Corporation to smartphones. The story follows Adol Christin, a red-haired adventurer, who finds himself on a beautiful island inhabited by the winged "Rada" tribe. He must solve the mystery of the tribe's legendary heritage and the Great Vortex of Canaan that swallowed him.

The game features the original story of Ys VI as its main story, along with new memories and intimate events that allow players to experience the unique "kindness" of the Ys series. The game has a variety of adventure elements, including arenas, cooperative play dungeons, and world events. Players can also trade with fellow adventurers in the marketplace. The Ys world is open for exploration with high-quality art and exciting action battles. The game is free to download and play, and it offers in-app purchases.