Isekai Tensei: Recruited to Another World Volume 15

The empire has officially declared war on the Kingdom of Krastin, and to make matters worse, their undead army has broken through the front lines of Margrave Haust’s lands. The mere mention of zombies lights a fire in Tenma, and he and Merlin immediately head to the battlefield! They overwhelm a horde of more than a hundred thousand zombies, but their victory is cut short by the appearance of a terrifying grim reaper. This creature is unlike anything they’ve ever faced before and pushes Tenma to his limits! Old grudges and painful memories start to collide, setting the stage for an otherworldly final battle.