In the Land of Leadale, Vol. 5 (light novel‪)‬

Great Power, Even Greater Responsibilities
One day, Cayna receives an urgent correspondence from Shining Saber, a fellow Leadale player also transported to this new world. It turns out that a horde of monsters is headed for the royal capital and he needs Cayna to lend her mighty skill arsenal to stop the beasts. But when a Guardian Tower in the form of a giant tortoise appears during Cayna’s absence, will her friends Exis and Quolkeh have what it takes to handle things themselves?!