The War Of Original Vampires (真祖大戦 Sinso taisen, lit. Grand Fight) is the fifteenth novel of the Strike the Blood series.
Velesh Aradahl, chairman of the Imperial Assembly of the Warlord's Empire, has made his move. With his vast combat experience and boundless knowledge of primogenitors past, he's shaping up to be one of Kojou's toughest opponents yet! The clock is ticking. Can Kojou defeat his latest adversary before Itogami Island ceases to exist in only twelve short hours?!
- Chapter One: Sign Of Disaster
- Chapter Two: Duel At Twilight
- Chapter Three: Alrescha Glacies
- Chapter Four: The War Of Original Vampires
- Chapter Five: Empire Of The Dawn
- Chapter Six: Returning
The volume was adapted into episodes 7-10 of Strike the Blood III.