It was created using the world view of Shinobi Kill.

Mako, a second-year middle school girl who committed suicide in despair, was possessed by a ninja spirit and returned to the world. The ninja spirit, which had been dead for more than two thousand years, returned to the world with a strong desire for revenge. It lurked in the girls' school and continued to accumulate its power of revenge. In the explosions and fires, it vowed to kill all the ninja spirits in the world.

The ancient book "Ninja Words" records that when the world returns to the end of the Dharma, ninjas will resurface and bring about a dark and brutal rule. However, there is still a glimmer of hope that new ninjas will emerge from among the mortals to rise up in rebellion.

Now, deception, oppression, and exploitation are gradually filling the world. Ordinary people live in a false and manipulated life, ignoring cries for help and refusing to fight back against violence. Their blood and sweat are being slowly devoured, yet they remain oblivious. Once again, the world is heading towards the end of the Dharma.

When a cute, cuddly catgirl meets a cool, aloof school beauty, an unexpected event brings them together. The catgirl's charm and adorable antics gradually melt the school beauty's icy exterior, while the school beauty's attentive care makes the catgirl feel the warmth of home. From initial dislike to inseparable companionship, their daily lives are filled with sweetness and laughter.