Books in the How a Realist Hero Rebuilt the series

TO THE NORTHAfter defeating the Gran Chaos Empire, the Great Tiger Kingdom becomes the dominant human nation, splitting the world in two. King Fuuga then extends an offer to his would-be enemy Souma: a joint campaign to the Demon Lord's Domain! Risky as it sounds, Souma recognizes the need to liberate the demon front and accepts. He gathers information on the mysterious demons in earnest, but when their forces go on the march, the demons seem to possess power beyond anything Souma imagined!

BROTHER, MY BROTHERThe Demon Lord’s Domain has been liberated, ushering in a new era. With the demons no longer a common enemy, the threat of a power shift hangs in the air. Who will triumph if the Maritime Alliance led by the Kingdom of Friedonia clashes with the Great Tiger Empire of Haan? While Souma is busy mobilizing his personnel for the impending conflict, Yuriga approaches him with a shocking request to return home. As it turns out, it’s merely part of Yuriga’s plan to corner her own brother, the Great Tiger Emperor!

"In the two years since the Spirit King's Curse shook the world, the Kingdom of Friedonia has prepared for impending chaos...but it's not the only one making moves. The Great Tiger Kingdom of Haan has brought to heel two more powerful countries, and now Fuuga declares war on mankind's greatest nation: the Gran Chaos Empire. Will the Kingdom abandon its ally the Empire to steer clear of Fuuga's wrath, or take up arms and risk everything?"--Provided by publisher.