Red Hot Moon

It is said that whenever the red moon appears, one can summon a person who is said to be Pelastaja in that world from a different world. However, every time the red moon appears it will always be a disaster for the world. Many monsters appeared and became aggressive, killed many humans of various races, and made several lands into chaos. Ryuki Kotaro, a criminal man about to be executed and a 21-year-old ex-soldier, is summoned to another world by a cat-eared girl to save that world. Don't know what happened to force him to get involved with all of this, he couldn't help but have to help the girl and find his new purpose in life.