Sanbiki no Inu no Yoru

More than fifty years have passed since the Great War engulfing the whole world came to an end.
Yet civil wars and quarrels kept going on relentlessly.
At this point in time, there exists a vast peninsula known as Hasou, a land greatly affected by the War, abandoned by the authorities.
Here lies two existing factions, Son and Gotou, where the story takes place with their conflicts.

[Translated from Official website]