Isekai Kaeri no Ossan wa Shuumatsu Sekai de Musou suru

It's been three years since Azami was first summoned to another world. With the unique Samurai class, he defeated the Demon King along with his party of warriors. When he finally returns to Japan, he comes to know that the world is now filled with zombies...!? Realizing that his skills acquired from the other world remain, he sets out into the city to seek the truth and search for survivors. From a hardware store to a school, through the city hall and the police station... Using his magical powers for increased physical strength and strengthening his weapons, slashing through a sea of zombies on a motorcycle, what is it that awaits Azami...!?