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.

Interstellar pirates raid, alliances crumble, and a dark matter called black gold suddenly appears. Its highly radioactive and destructive power threatens all of humanity. Simultaneously, alien species frequently create crises, and large-scale mutations occur in humans, with black gold becoming the first suspect. Evolution or purification? Humanity faces its greatest existential crisis and dilemma since entering the interstellar age...