The Apocalypse Arrives, and I Have a City in the Sky

Rich Tycoon + College + System + Campus Belle

In the Apocalypse, You Should Build a Private Shelter! Ideally, Bring the Female Lead Along to Lay Low.

Most people don't have such lofty ambitions. Don't have them build some incredibly powerful survivor settlement at the drop of a hat; it's hard to manage and easy to make the story fall apart.