In the underground city-state of Subtramuros, there is a boy named Lars who dreams of becoming a Hero. However, in a society where guns and magic are commonplace, he is talentless in both aspects and can only use a sword. Despite his shortcomings, he does not give up and trains hard to reach his goal.

But when a certain tragedy arises and shatters his dream, he is forced into a dilemma of whether he should hold on to his heroic ideals or succumb to the darkness.

That’s when a magical catgirl appears before him and offers him her magical blades, Black and White.

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