If you had a door to ancient times, what would you do? Sell cultural relics, bully natives with weapons ahead of the times, or simply build an empire of your own? If you had a door to another world, what would you do? Go to the Magic Academy to marry and learn magic, take adventures in ancient ruins with adventurers, or simply marry an elf and go home as a wife? What would you do if you had a door leading to a parallel plane? What is the difference between being a singer, being a writer, being a game developer, or simply being the founder of an evil consortium empire?