The Guin Saga Novel Volume 2

Guin Saga 2: Warrior in the Wilderness is written by Kaoru Kurimoto.

Guin is a mighty warrior who cannot remember his past. His only clue is a leopard mask mystically attached to his head. Joined by the royal twins of Parros, Remus and Rinda; Suni, the simian-girl; and Istavan, the mercenary; our hero must cross the treacherous River Kes and journey into the badlands of Nospherus, where unthinkable dangers lurk. In hot pursuit is a Mongauli army of 15,000, led by the beautiful and dangerous General Amnelis.