From the introduction:
December 26th, 2017. The Master of Chaldea saved humanity. They felled Goetia, and wiped out the remnants of the 72 Demon Pillars. Chaldea’s mission done, they presented modified reports to the Clock Tower and the UN, and the organization, now without use, was auctioned to the highest bidder. One Goredolf Musik was the one to purchase Chaldea, and he will visit it for the first time on December 27th. Unfortunately for everyone involved, Goredolf’s secretary Koyanskaya was in cahoots with the Alien God, and destroyed Chaldea with the aid of an army of Oprichniki, forcing the eight remaining Chaldea staff to escape the Storm Border. After coming across a massive army of Oprichniki barring Antarctica's coastline, Sherlock Holmes will use the Shadow Border’s special engine, the Paper Moon, and dive into Void Space, more commonly known as Imaginary Numbers Space, ending up in the first Lostbelt three months afterwards. The Bleaching of the Earth will be carried out during this, and the World will find itself facing complete destruction once again.