An anthology comic of K-On! by various mangaka.

Calling all red and lizard, I'm here! In the age of civilization, a mysterious young lady called Beni Kagee appears on the edge of a power struggle filled with pretense. It is also the daring figure of the deified child Mari, who wields a white blade to protect her loved ones and kills because she mourns her loved ones.

Note: Never collected in a tankoubon.