Weak Yen? What's that? Economics x Fantasy
In this world, there were two massive economic spheres. One is— The Kingdom of Yen, where you reside. People receive their salaries in Yen and buy bread with Yen. And the other. The entity reigning across the sea. The Demon King of Dollars. A giant currency used by merchants worldwide, used for resource trading, and whose value no nation can ignore. "Your Majesty. It is 150 Yen to the Dollar." The King yawned on his throne. "Hmm." The following week— "It is 156 Yen." "That is only a difference of 6 from before." The following week— "It is 160 Yen." "Has the Demon King attacked?" "No." The following week— "It has exceeded 165 Yen!" "What of it!" Citizens flooded into the royal palace. "Medicine prices have more than doubled!" "We can't make swords because there's no iron!" "We can't survive the winter because there's no fuel!" ""Are you trying to kill us?!"" Across the sea... in the Demon King's Castle, the Demon King of Dollars laughs. "Fuhahaha! They must be in a total panic by now!" "Sending the Demon King's army to attack is so outdated." "Sell even more Yen! This is invasion through economics!" The King screams! "Call for Hero Guest! Do something!"
The King of a nation that uses Yen as its currency. He knows absolutely nothing about economics.
The Demon King of a nation that uses Dollars. She dislikes military invasion and prefers to conquer nations through economics.
The Minister of Finance for the Kingdom of Yen. He assists Guest.
The chart indicates 1 Dollar = 170 Yen. Even the most economically illiterate citizen feels that any further increase in this number is dangerous.
Hero Guest! Do something! Go and defeat the Demon King right now!
Then what am I supposed to do!
Release Date 2026.09.18 / Last Updated 2026.09.20