Genre: Supernatural, Action, Harem Ecchi, Fantasy, School, Vampire, Shounen
Original Name: Sutoraiku za Buraddo
The story follows the adventures of Kojou Akatsuki, a vampire in high school who is a bit reluctant to show his powers, and Yukina Himeragi, a teenage Sword Shaman apprentice who is sent to observe him. It takes place in the Demon District in Itogami City, a man-made island off the coast of Japan that has a freely mingling monster populace. Kojou is suspected of being the Fourth Progenitor, a powerful vampire that could potentially disrupt the balance of power among the ruling three Progenitors. Kojou and Yukina befriend various monster students, some of whom are attracted to Kojou, and whose situations drive his libido that provides the source of much of his power.
Kojou was a normal 16-year-old high school student 3 months prior to the beginning of the story, until becoming the 4th progenitor after his predecessor, Avrora Florestina inserted her spirit into his body as the result of a wish. He claims to remember nothing of the incident. When aroused, his blood lust takes over and the only way to satisfy it is to drink his own blood, usually from the nosebleeds he experiences. As a vampire, Kojou possesses superhuman strength, speed, reflexes, and durability, but has far greater power than that of a normal vampire due to his status as a progenitor. He has also inherited Avrora’s twelve familiars. Due to never having drank human blood, Kojou at first has no control over his powerful familiars, but after drinking an individual’s blood, one familiar will acknowledge him as its master. By drinking the blood of others who have familiars, he is able to gain control over their familiar. He often blurts things out without thinking of how Yukina feels and annoys Yukina in a way unintentionally. By volume 9, he is able to control 6 of the familiars. Kojou is also lacking the 6th, 10th and 12th familiars, the 12th being in Nagisa and the 6th and 10th still have their human bodies. In Strike the Blood EX, he has two daughters (in the future); Reina from Yukina, and Moegi from Asagi.
A 14-year-old middle-school Sword Shaman from the Lion-King organization, Yukina was sent to observe the 4th progenitor and was told to kill him if he becomes a threat. At first, Kojou tries to trick her into thinking he’s the wrong person, but his strength is revealed when he intervenes in a fight between her and another vampire. She is constantly following him everywhere he goes and as a result has become very close to him, even allowing him to suck her blood in order for him to gain control over his familiars. Unknown to her, she was actually sent for this very purpose; with the organization intending for her to be his first blood partner, and even his mate. Like many others, she was supposedly sold to the Lion-King organization by her parents. Yukina is afraid of flying as shown in episode 10 with Kojou noting that Nagisa also have the same fear. Yukina often get irritated by Kujou when he somehow mention something like being with her sucks that makes Yukina upset without noticing her feelings for him. For instance in episode 10 when they were trapped on an island, he mentioned that staying there with Yukina for the rest of their lives would suck a lot angering Yukina as he just blurted out things without thinking of her feelings. Yukina is showned by the end of the first arc, she seems to have developed feelings for Kojou. She offered her blood many times to Kujou even to resurrect him when he was pierced by Kanon as was shown in episode 12. She does not hesitate at all when it comes to Kujou showing multiple times that she does love him a lot. In episode 19 she even told him to stay by her side forever as she is always worried when Kujou is up to something stupid and risk his own life for others. In Strike the Blood EX, she is presumed to be married with Kojou and they have a daughter named Reina.