A Commander's Blade [Punishing Gray Raven Fan-Fiction]

A story of a man who runs a peaceful dojo and also a kind-hearted and intelligent boy who lives alongside with his sister. He became the dojo's breadwinner after their parents death, training the students while struggling through the punishing virus incident. His family and students are able to enjoy a relatively peaceful life.

One day, when he went to the central city to buy some stuff. On his way back, it all happens in a blink of an eye, the skies dark as night, fire ravaging across the vicinity, people screaming in agony, blood splattered all over streets, screeching noises of corrupteds all over.

When he went back to the dojo, he was met with a horrifying sight--- his sister and students at the dojo has been slaughtered.

Consumed with anger and hatred, he swore to avenge his sister's and her students death.

And met by unfamiliar group called Babylonia Task Force.

Will the wheel of fate turns against him or the opposite?