Re:Zero -Starting Life In Another World- EX Vol. 4 (Light Novel)

Set before the start of the Royal Selection, the Kingdom of Lugunica is shaken by the shaken by the death of the royal family, and the knights of the royal guard, who rush to defend the kingdom, are tasked with escorting a diplomatic mission to the neighboring Sacred Vollachia Empire, which has repeatedly clashed with the kingdom. What awaits Julius, Ferris, and Reinhard in Vollachia, which was founded on the philosophy that only the strong survive? And how will their relationship with this turbulent nation change the course of Lugunica?
Notice: This book is written in Japanese.