Muddle Demon King Won't Encounter the Retired Swordsman

Traveling to an other world is a very happy thing. Becoming the Demon King is an even happier thing. When two happy things come together, even becoming a girl is no longer unacceptable. It should have been this way. Leticia thought she would follow in the footsteps of her travelling predecessors, becoming invincible and having a magnificent crystal palace. However, she encountered the enemy of her life, the human swordsman. "How can there be such a perverted person? Is there no way to live?!" Leticia, whose confidence was devastated, became closed off and ran into the human world to give up her target. But why is the swordsman there as well? Original Novel Official English