The Hero storms the Demon King's castle expecting a final battle, but finds the beautiful Demon Queen proposing an alliance instead! (〇o〇；) She explains that suddenly ending their 15-year war would cause economic collapse and civil wars on both sides - they need to slowly transition society first. Together they go undercover to introduce new crops, printing presses, and advanced farming to build prosperity without war dependency! ヽ(ヅ)ノ

(⌐■_■)oO omg you gotta check this out