A Reincarnated Witch Spells Doom, Vol. 5 (manga)

Sena has freed the fire dragon king Gideon from his magical chains and learned about the motive behind Emperor Isaac’s provocative actions. Plus, Keith is revealed to be a steerer, one who can draw upon the caller's powers. As Sena and Keith contemplate their futures, they are summoned by the water dragon queen Sealiene to the kingdom of Ciepra, where a civil war is brewing!