Agnes is a girl who belongs to an adventurer's party formed by her fiancé, the third prince, as a hobby. One day, the prince abruptly breaks off their engagement and expels her from the party because she can only use water magic. Being freed from the prince, Agnes takes advantage of the situation and sets off on a free-spirited journey with Inari, a legendary fox she met while camping out. However, Agnes's water magic has extraordinary abilities...?