She is one of Kojou's classmates who works as a part-time computer programmer at the Security Department of "Itogami Island Management Corporation" in Level B. She is very proficient with computers and deciphering complicated codes, which is why she was kidnapped by Christoper Gardos to awaken the "Nalakuvera" a so called ancient weapon of the gods. She created an AI program that she calls "Mogwai" that she uses to help her break into any firewalls, to hack into any secured sites or create and alter any programs. It was pointed out she has feelings for Kojou.

(Source: Zinc-view)

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)

__Height:__ 167 cm

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A Japanese voice actress. Her debut role was Yoshino Takatsuki in Hourou Musuko. She likes to draw, and she became addicted to karuta while dubbing Chihayafuru.

__Non-Anime Roles:__ ~!
Aika Tenkūbashi in "Ore ga Ojō-sama Gakkō ni "Shomin Sample" Toshite Rachirareta Ken" (dramaCD)
Andromeda in "Starly Girls -Episode Starsia-" (VG)
Ayaka Kagari in "Lord of Vermilion IV" (VG)
Ayame Itō in "Corpse Party 2 ~ DEAD PATIENT" (dramaCD)
Baizhi in "Wuthering Waves" (VG) (Japanase)
Beruno Souda in "Racing Musume" (VG)
Carmen Sandiego in "Carmen Sandiego" (cartoon)
Clarke Griffin (voiceover for Eliza Taylor) in "The 100" (Live-action TV)
Contender in Girls' Frontline (Mobile Videogame)
Diana Celestine May in "Implosion: Never Lose Hope" (VG)
Eri Kumagai in "Music Girls (Ongaku Shōjo) projects" (songCD and dramaCD)
Hannah (voiceover for Odeya Rush) in "Goosebumps" (live-action movie)
Isabella in "Gargantia on the Verdurous Planet ONLINE FLEET" (VG)
Jessica in "Granblue Fantasy" (VG)
Kana in "Tales of Link" (Mobile VG)
Kujou Sara in "Genshin Impact" (VG)
Lili in "Street Fighter X Tekken" (VG)
Linde in "Fire Emblem Heroes" (VG)
Linde in "Genei Ibunroku ♯FE" (VG)
Little Alice in "Wonderland Wars" (VG)
Lyfe in "Snowbreak: Containment Zone" (VG)
Mai Sakurajima in "Seishun Buta Yarō Series" (Niconico Drama)
Meria Shiranami in "Maid ga Oshieru Maou-gaku!" (Drama CD)
Nagisa in "Monster Hunter Mezeporuta Kaitakuki" (VG)
Princess Stella in "Grand Sphere" (VG) (Japanese)
Shiranui Nanami in "NORN9 Act Tune" (otome VG)
Shiranui Nanami in "NORN9 Last Era" (otome VG)
Shiranui Nanami in "NORN9 Var Commons" (otome VG)
Shiranui Nanami in "NORN9" (otome VG)
Sofia Tenma in "Racing Musume" (VG)
Sonia Blanche in "BLADE ARCUS from Shining EX" (VG)
Sonia Blanche in "Shining Resonance" (VG)
Surge in "E.X. Troopers" (VG)
Tiki is My Wife P in "Genei Ibunroku ♯FE" (VG)
Tsukuyomi in "UNDER NIGHT IN-BIRTH Exe:Late" (VG)
Urara Taguchi in "Girl Friends" (drama CD)
Wilbell Vollerslied in "Atelier Ayesha ~Tasogare no Daichi no Renkinjutsushi~" (VG)
Wilbell Vollerslied in "Atelier Escha & Logy ~Tasogare no Sora no Renkinjutsuhi" (VG)
Wilbell Vollerslied in "Atelier Shallie ~Tasogare no Umi no Renkinjutsuhi" (VG)
Kasane Randall in "SCARLET NEXUS" (VG)
Reina in "Tekken 8" (VG)!~

He never asked for this power.
 
Kojou Akatsuki used to be an ordinary high school boy--but that wasbefore 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 second season of Strike the Blood. The adaptation of 9th, 11th and 12th LN volumes.

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)

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 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 fifth season of Strike the Blood.

Asagi Aiba