Full Clearing Another World Under a Goddess with Zero Believers (Manga) Volume 6 by Isle Osaki

With the blight dragon dead and Labyrinthos saved, a triumphant Makoto Takatsuki finally returns to Macallan. He soon receives an invitation to visit the capital city of Roses, but there’s just one problem: the summons comes from Princess Sophia, the frigid water priestess who once declared him useless. After a cold royal reception and a nasty run-in with some knights, a chance encounter allows the princess’s younger brother, Prince Leonardo, to witness Makoto’s magical mastery in action. Princess Sophia is befuddled by her brother’s newfound hero worship, but before she can warm up to the idea, a horde of monsters attacks the capital! Can Makoto thaw his icy relations with Princess Sophia in time to save the citizens of Roses?