Hideaki Arai was a gamer who commanded a galactic fleet from his phone. When a monstrous alien cockroach attacks, a panicked shout triggers a real magic circle, teleporting him onto the bridge of his flagship.

His dream is real. He's the Admiral of thirty thousand warships, with a crew of flawless officers. Their mission: neutralize the cosmic threat.

But he soon discovers a devastating truth. His entire planet-killing armada is the size of a mosquito.

The alien dreadnought is a common cockroach. Now, Arai must lead thirty million microscopic crew in a desperate battle across the treacherous landscape of his own apartment, where a dust bunny is a mountain and the fate of his bedroom rests on a war he never saw coming.