Isekai Cheat Magician

The King's brother, Dortesheim has declared war on Elistain Magic Kingdom, and finally waged a formal battle on the plains of Marwalt. The Kingdom has dispatched its soldiers against them, accompanied by Taichi and the others. Rin, Muller, and Lemia all face their own battles against strong opponents, while Taichi storms the enemy's main camp and takes action to end the war. Yet during the intense battle, the Kingdom's Cardinal, Lodra, is meeting with a mysterious person in the cathedral...