Yukina Himeragi is the female protagonist of the series. She is an attack mage, or in the Lion King Organization, a Sword Shaman, who is sent by the Lion King Organization to observe the Fourth Primogenitor, Kojou Akatsuki. As she's appointed to observe him, she became a middle-school student studying in Saikai Academy who follows him everywhere and is also ordered to kill him if he becomes too powerful and insane to control himself. ~!She is also the first blood mate of Kojou, and thus being the first, her blood smell is always associated with Kojou's own smell, which has been pointed out many times by other characters who could smell blood, probably due to her blood interbreeding with Kojou's as she was the one who activated Kojou's first 'real' vampiric act. Also, unknown to her, she was intended and prepared by the Lion King Organization to be his lover.!~

The Fourth Primogenitor—That's the world's strongest vampire that should only exist in legends. Accompanied by twelve Kenjuu and spreading calamity, this phantom vampire appeared in Japan. For the observation and obliteration of this Fourth Primogenitor, the government and Lion King decided to dispatch an attack mage known as a Sword Shaman. However, for some reason, the one chosen for the observation was a apprentice Sword Shaman girl, Himegari Yukina. Wielding the strongest anti-primogenitor spirit spear, Yukina arrived at Demon District, Itogami City. What is the true identity of the Fourth Primogenitor, Akatsuki Kojou, she encountered over there!? 
(Source: Baka-Tsuki, edited)

__Agency:__ Office Osawa
 
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On September 1, 2016, Office Osawa announced that Taneda would put her career on hiatus to focus on treatment for her throat, various roles she done were recast during this time such as Erina Nakiri from Food Wars who was replaced by Hisako Kanemoto from Season 3 and onwards.

On August 4, 2017, Office Osawa announced that her treatment was successful and she would gradually return to voice acting.

__Non-anime roles:__
~!
• D.Va in "Overwatch" (VG)
• Kuon in Utawarerumono (VG series)
• Shirasu Azusa in Blue Archive (VG)
!~


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Micaela Carla Oddera is an Argentinian singer and voice actress.

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. The adaptation of 9th, 11th and 12th LN volumes.

He never asked for this power.
 
Kojou Akatsuki used to be an ordinary high school boy--but that was before he became the Fourth Primogenitor, the most powerful vampire of all time. Worse--he doesn't even remember how it happened. Middle schooler Yukina Himeragi, meanwhile, is the Attack Mage sent to observe him--and to stop him if he gets out of control. But was it really a good idea to send a cute girl to observe a massively powerful vampire boy whose abilities activate whenever he gets aroused? And on an artificial island populated with all manner of demonic individuals, each with their own designs on the Fourth Primogenitor--?!
 
(Source: Yen Press)

The third season of Strike the Blood. 
 
It was announced at a Dengeki Game Festival stage event that the Strike the Blood light novel series will get a third OVA release. It will cover until the end of Seisen-hen. 
 
(Source: MAL news)

The fourth season of Strike the Blood.

While several of the girls investigate Vatlers ship afloat, Akatsuki and Himeragi wake up alone in the school gym with no memories of the day before and no explanation for why they were asleep on the same futon and why Himeragi is wearing an old-fashioned school PE uniform with bloomers. A bloody baseball bat and missing weapon soon deepen the mystery as assorted forces race to solve the mystery of the empty boat, the bloody bat, and the purple bra in the MCs pockets!

The spinoff series follows Yukina, Nagisa, and Kanon in their everyday lives in middle school

The fifth season of Strike the Blood.