It is a normal evening in the city of Uminari. The moon is bright. The sky is clear. The city lights twinkle and glow within the glass chasms of urbanity.

And then it isn't.

A wall of light sweeps through the skyscrapers. Movement stops. People vanish into thin air, leaving nothing behind. The ever-present rumble of city life cuts off, leaving only eerie silence.

Eerie silence broken only by the sounds of distant explosions... each one closer than the last.

Outside the glass, visible in the strangely tinged sky, there is a girl. Flying backwards. In a black cloak. Carrying a scythe made of lightning.