Kuromukuro tells the story of a young girl named Yukina whose life is upended when she accidentally activates an ancient artifact found during the construction of a dam.
From within the artifact emerges Kennosuke, a samurai from the Sengoku period, thrust into the 21st century.
Their encounter coincides with an extraterrestrial threat that begins to target Earth.
Yukina and Kennosuke find themselves fighting together to defend the planet against these invaders.
As they battle, they uncover secrets about Kennosuke's past and the true purpose behind his sudden appearance, hinting at a connection between them that goes beyond chance.