Spirit Beast

A phenomenon where humans are changed to shadowed monsters or known as Shadow Beast or SB for short but a group of furry humanoid heroes known as Spirit Warriors that stop and purify the SB. The Spirit Warriors are secretly regular high school students with animal marks on their bodies. With these animal marks, they can transform their beast form by touching the mark and chanting the incantation. They tried to hide their identity carefully but one boy finds out and wants to join them. Little they'll know that their meeting will cause them to find out not only how the SBs are created, but their origin of the mark and beast form will also be revealed.