With one success after another, and connections to nobles and royals alike, things are going well for Mitsuha's General Store. That is, until a neighboring kingdom launches a surprise invasion! At first, Mitsuha intends to stay out of the fray, but after being summoned to a war council meeting, a particular incident ignites a fire inside her. Will the Lightning Archpriestess be able to lead her adoptive kingdom to victory against their attackers?!