Doomsday: Starting from Mana Ecology

In the "lighthouse" of the doomsday city made of steel, everyone has a mark on the back of their neck - both a belief and a shackle. The lighthouse claims to guard the last fire of mankind, but it is trapped in huge lies and rigid classes. As the Mana ecology continues to encroach on the world, is this self-contained steel fortress an ark of civilization or an exquisite cage? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.