Koga Tale of Yin & Yang - The Murderous Mother by dai2hokenshistu

The year 23XX.
A world where civilization collapsed, and everything reset.
As humans return to prominence, so do the ninjas working behind the scenes.
Among them, the Koga ninja Ayaha and her son Aime spend their days taking on jobs from the village.
With Ayaha skilled in assassination, and Aime skilled in intelligence and espionage,
does a bright future await them?