When the Royal twins Remus and Rinda are forced to flee by the invading Mongaul army, they are saved by a mysterious leopard-headed warrior. His name is Guin, but he has no memory prior to meeting the twins. As night falls, the group are attacked by ghouls and must once again fight for their lives.

The battle between the Sems and the Mongaul army has finally begun. Although at first the Mongaul's numerical superiority seems an insurmountable obstacle, Guin's decisive strategies allow the Sems to even the odds.

The defeated lady Amnelis returns to her father, where she learns that he has plans to have her married; meanwhile Guin prepares to leave Nospherus, vowing to one day return to the Lagon and Sem. The prince of Crystal returns to his city, only to be betrayed and captured.