In such a diverse world, it might be hoped that discrimination would be a thing of the past. But people are not so good or kind. Mina Ashido is twenty-four and a thief, forced into the villain-infested labyrinth known as the Musutafu Underground, a vast subterranean city. And now she's gone and fallen in love with the Number One Hero, Izuku Midoriya. This can't end well. Or can it?