The fourth Progenitor is the most powerful vampire once thought to exist only in the world of legends. Yet when it appears in Japan, the government for some reason chooses an apprentice "sword shaman", Yukina Himeragi, to observe and obliterate it. Bewildered by the disproportionate task and its specific details, Yukina arrives at the Demon District of Itogami-jima to watch Akatsuki Kojo, and a student at a private high school on Itogami-jima.

[Source: Crunchyroll]

Kojou and Yukina are on their way to school as usual when they find La Folia being chased by someone. Yukina crosses blades with the enormous man who's pursuing her, but before the fight can escalate further, La Folia makes a shocking comment: "Father, this is the Fourth Progenitor, Akatsuki Kojou... my first!" La Folia's father, Lucas, had told her to decide who she wished to marry, so she declares that Kojou is her choice. Lucas refuses to accept this, but then La Folia's mother, Polifonia, invites Kojou and Yukina to a party so they can all talk in more detail. When they arrive at the party, they discover that Asagi, Yaze, Nagisa, and Sayaka have been invited as well, due to their connections with Kojou. What sort of heated battle is about to break out between the many girls in Kojou's life?!

[Source: Crunchyroll]

The second season of Strike the Blood which adapts three arcs from the 9th, 11th, and 12th light novel volumes.

[Source: MyAnimeList]