Ogrou, who was reincarnated as a goblin, reigns as the leader of a village in a world where the fittest survives. The Ogrou Corps, which participated in the war between humans and elves as a mercenary group on the elf side, continues to advance against the enemy's elite forces. One day, Ogrou is approached by a strangely familiar boy. This boy is Phillipo [the bone bug brave], the ace of the outnumbered human army! Ogrou's body is pierced by Phillipo's familiar, a giant centipede, and he gradually loses consciousness... The fourth volume of the popular monster reincarnation fantasy comic!!