Magical Explorer, Vol. 5 (light novel)

TWO LITTLE SISTERS, ONE HAPLESS DUDE When Kousuke’s classmate Gabby gets word thathe’s been appointed assistant vice minister of the Ceremonial Committee, she’s so scandalized that she challenges him (and Yuika) to a dungeon clearing race where the losers have to step down from their positions. Despite the high stakes, Kousuke agrees to her terms when he realizes he can use the knowledge of Gabby’s up bringing he gleaned from the game to ensure she goes down the right path. But does Kousuke really have what it takes to stave off the sadness and insecurity weighing on Gabby’s heart?