Starting from Demon Slayer and Becoming the Best

Lu Ming'an, a mathematics professor who woke up drunk, found that he had traveled to a strange world similar to the prosperous Tang Dynasty, but where demons were rampant. He became a low-level "devil slayer" who had just been beaten to death by a dog demon and had only one year left to live. Equipped with a mysterious system that consumes lifespan and improves skills, he studied all the lifespans at the beginning, and instantly performed the "Exorcism Sword Technique" to perfection, killing evil spirits with one sword. In order to survive and to find out the truth, he was forced to take over a strange team composed of "Heaven and Earth" and work in the unpredictable Demon Slayer Department. With the brains of a mathematics professor and the sword skills that can slay demons, Lu Ming'an embarks on a thrilling journey of using wisdom and blades to carve out a way out in this world where force is the most important and demons are in trouble.