Strike the Blood

is a Japanese light novel series written by Gakuto Mikumo, with illustrations by Manyako. The series began publication on May 10, 2011 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Story
The fourth primogenitor is the strongest vampire who exists only in the world of legends. Yet when this masters the Twelve Kenju, the spread of the catastrophe of the vampires will appear in Japan.

In order to spy on and erase the fourth primogenitor, the government-owned Lion organization has decided to send an attacking magician a "sword shaman" to complete the task. Yet, unknowingly, the one who was selected to spy was actually a trainee "sword shaman" girl Himeragi Yukina.

Strike The Blood
An anime adaptation of the first six volumes of the light novel which ran for 24 episodes. It aired between October 4, 2013 and March 28, 2014.

Strike The Blood II
The second season of the anime that adapts volumes 9, 11 and 12 light novel. It aired for 8 episodes, releasing in intervals between November 23, 2016 and May 24, 2017

Strike The Blood III
The third season of the anime that adapts volumes 13 - 15 of the light novel. It aired for 10 episodes, releasing in intervals between December 19, 2018 and September 25, 2019

Strike The Blood IV
The fourth season of the anime. It aired for 12 episodes, releasing in intervals between April 8, 2020 and June 30, 2021