The TV animation "Strike the Blood" is adapted from the work of Japanese novelist Gakuto Mikumo. The story tells that Akatsuki Kojou, who was originally just an ordinary high school student, became the fourth true ancestor of the demon clan, who only exists in legends and is known as the world's strongest vampire. In order to monitor and eliminate the fourth true ancestor who may destroy the balance of the world, the government's secret agency Lion King Agency sent a magic attack master sword wizard to complete the task. They finally chose an apprentice sword wizard girl Himeragi Setsuna. After becoming the fourth true ancestor, Akatsuki Kojou met the girl and was involved in a series of events that had nothing to do with his daily life, kicking off a harem fantasy story full of elements such as fighting and love.