How A Realist Hero Rebuilt The Kingdom Vol. 8 (Light Novel)

In Vol. 8, a crisis befalls the Union of Eastern Nations, a confederation of small and medium-sized nations, due to a massive outbreak of demons appearing in a “Demon Wave.” Kazuya meets with Empress Maria of the Gran Chaos Empire and receives a request to send reinforcements to the Union. He accepts and sends reinforcements to the Kingdom of Lastania. There, he encounters his former enemy, the Crown Prince Julius who was once expelled from the Principality of Amidonia, is fighting hard as a visiting general…?! And now, standing back-to-back with Julius, Kazuya uses the strength of his retainers to launch a rescue mission to save Lastania!
Notice: This book is written in Japanese.