I read this manga a while ago and want to reread it but I don't know the name. It was a yaoi manga where the main character was sold to a man with animal characteristic and the main character had like a slave contract that made it impossible for him to talk. It was not a colored manga that is all I remember.
A male assassin is transmitted to a new world where he doesn't know the language. The world is forest like and is throw into a battle between the people he is with and most of the people die. There is a female lead i think. It's been a long time since I read it