A free program for Windows, by Netmarble.

The Seven Deadly Sins: Grand Cross is a grand strategy RPG where you play the role of the Third Princess of the Kingdom of Liones. You will be able to protect your people from the seven deadly sins that want to take over the world. You will have to fight against other players in order to become the greatest leader. You will need to collect heroes and items in order to protect the kingdom from the seven deadly sins.

The game starts with the princess setting off on her quest to save her kingdom from the deadly sins. She will have to fight against other players and find out what is going on in the world. She will meet other players that will help her in her quest.