Yokai Senkai-ki by a supporting captain ~ Kaizoku Knights in エンヴィラン ~ (2) Earth Star Novel

Product description ※Please note that product information is not in full comprehensive meaning because of the machine translation.

Strangely, I spread to a different world and became an adventurer as 「 Captain 」. I helped people who could be heroes all over the place and got the title of 「 Kaizoku Knights 」 from the king. One day, a man from the northern border defense force approached me and asked me to help him. I was impressed by the way he broke the military rule and threw his own money to help his friends. I promised him my cooperation, but when I went to the scene, a large number of zombies were attacking a fortified city near the border?