My Ex-Boyfriend Is the Great Demon King of Destruction

When I was walking home with my coffee, it suddenly became dark. It's not the gradual blackness of a cloudy day, it's like someone took a huge black cloth and covered the whole city. The street lights were all on at that moment, but the yellow light couldn't penetrate the darkness above the head at all, just like a few matches thrown into the abyss, they couldn't burn.