Prius Online is a Free-to-Play 3D fantasy MMORPG which revolves around a three character (3C) playing system. The 3C system consists of your main character, the Anima, and the Giga. The Anima is your character's companion, and the relationship you develop with her, as you try to unravel the mysteries of her forgotten past, determine her personality and strengthen your bonds. The Gigas, summoned by the Anima in times of battle, are strategic and dynamic mercenaries that fight by your side. Through this system the game aims to create rich and immersive emotional experiences for the character and the Anima.