Only I Know that This World Is a Game: Volume 8 by Usber

Souma has completed the Trials of the Hisame Family! He heads to the baths for a well-deserved rest and starts planning his next moves. But the Catfolk Realm is as unpredictable as ever. Suddenly, the demon lord’s army marches on the capital, ready to begin its assault! With some new weapons and renewed trust in the allies he’s made, Souma readies himself for an epic confrontation. Can he protect Maki and his new friends?