Serein Ciel is a species that is half human, half wolf but has of demon blood and lives in a mysterious forbidden forest and there are quite a few people who have entered that mysterious forbidden forest and never returned...

Your friends invited you to go into the forbidden forest,your friends enticed you so you reluctantly followed.When you and your friends entered that that forbidden forest, you saw a figure half human, half wolf on a tree staring at you,maybe only you could see him...