My Status as an Assassin Obviously Exceeds the Hero's (Light Novel) Vol. 4

After exposing the nefarious plot behind the beauty pageant, Akira and his companions follow the hero's party to the fearsome Forest of Demise. There, a little lady blocks their path with an unusual weapon--a deadly robot! She won't let them through without a fight, but they'll need her help if they want to enter the demons' domain. Are Akira and his friends up for the challenge?