A War of Primogenitors (真祖大戦 Sinso taisen) is the fifteenth novel of the Strike the Blood series.
The war that changed everything.
It's a Valentine's Day that Kojou won't soon forget! Amid the buzz of crushes and chocolate, dark words arrive on the wings of Glenda, the Dragon of the Swamp. Velesh Aradahl is holding Yuiri and Shio captive! And using them as collateral, he challenges Kojou to a vampire duel... At the same time, the Holy Ground Treaty Organization has deemed all of Itogami Island—altar for The Cleansing and domain of Dimitrie Vattler—a global threat. The only way to get the organization to overturn their decision is for Kojou to defeat Vattler and claim dominion of Itogami Island for himself! But can he do it in twelve hours, before the HGTO has the entire island destroyed?!
- Chapter One: Signs Of Disaster
- Chapter Two: Duel At Twilight
- Chapter Three: Alrescha Glacies
- Chapter Four: A War Of Primogenitors
- Chapter Five: Empire Of The Dawn
- Chapter Six: Homecoming
The volume was adapted into episodes 7-10 of Strike the Blood III.