High School Prodigies Have It Easy Even in Another World!, Vol. 4 (light novel) — Riku Misora

A Currency Crisis! After securing a cease-fire with (and learning some startling things from) Grandmaster Neuro, the Prodigies begin the process of handing over Elm's government to the people. An important step in that transition is the creation of a national coinage -- the goss. Unfortunately, the rest of the world isn't exactly keen on this fledgling nation introducing a new currency into the market. With conspiracies running every which way, Masato, the Devil of Finance, is forced to step in. With the master businessman on the case, his opponents will be lucky to survive with a single coin to their names!