High school DxD Reborn! Another Dragon awakens

This is the sequel to my story High school DxD the path of the sekiryutei. Issei is now the king of the gremories after saving Rias from death and making her his queen. After saving Rias from death, Issei went on to show the fighting force of the Gremories and defeated a key member of the OSF. But the battle is far fr...