Asagi Aiba (藍羽 浅葱(あいば あさぎ) Aiba Asagi) is a high-school student studying in Saikai Academy and the classmate of Kojou Akatsuki, Motoki Yaze and Rin Tsukishima who works as a part-time programmer at Gigafloat Management Corporation.

In Strike the Blood EX, Asagi is implied to be married to Kojou and together they have daughter named Moegi Akatsuki.


Asagi is a beautiful high-school girl with waist-length dyed blonde hair that is curled at the ends where it passes through her shoulder with a fringe with short hair strands at either side of her face that is tied in a long ponytail tied by a pink ribbon with bangs hanging over her forehead and pink-red eyes.

She is normally seen wearing the Saikai Academy uniform with a sweater. She wears a pink ribbon on her left wrist. Asagi's friend said that her skin, face, and her body are beautiful in general. She had black hair and glasses in middle school.


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She displays a tsundere-like attitude towards Kojou Akatsuki. She envies her rival-in-love, Yukina Himeragi.


She is an expert programmer and works for the Manmade Island Management Corporation. She has a crush on Kojou. Despite knowing the island is deeply connected to supernatural personals and creatures, she has no idea that her friends are among them. She is nicknamed Cyber Empress. Meiga Itogami noticed that Asagi could be the Priestess of Cain and is practically immortal. As long as she remains on Cain's altar which is Itogami Island, she cannot be killed by any means and the ritual ground will keep her alive by all kinds of factors. Her programming skills and Mogwai maybe also related to Cain.

Few years ago, Asagi met Kojou during middle school.


Right Arm of the Saint

Asagi and Motoki are helping Kojou out with his assignments in a restaurant

Emissary of the Warlord

Strike the Blood - 05 - Large 12

"The Two of you will be partner as doubles in Badminton"

Asagi and Kojou enter their classroom to see their classmates discussing the approaching games where they assigned Asagi to be Kojou's partner in the Badminton game. Asagi suddenly blushed and knew that Motoki is the one who planned it then, Kojou tells her that it's okay for him to play. Asagi goes to Girl's changing room to change her clothes with her friend. While changing her skirt, she looked at the mirror to see what she looked like, she makes cute faces at the mirror and then suddenly got ashamed of herself and yell "Stupid or Idiot".

Strike the Blood - 05 - Large 22

Asagi's cute face in a mirror ヽ(。ゝω・)ノ☆

When she go out to find Kojou, she saw Kojou with Yukina and saw that Kojou was holding a letter (Asagi thought that the letter was a Love Letter for Yukina) and said that looks like she's disturbing something (what she knows is that Kojou is inviting Yukina on a date) so she leaves. It was seen that she was crouching over Akatsuki in a seductive way, following the suggestion of Motoki "How to set up a Honey-Trap?".Akatsuki was sleeping then. When he saw her, he was flustered. Just the moment he was about to move her away, they fell from the bed. This scene was seen by Himeragi and Nagisa causing them to misunderstand Akatsuki. It was probably seen by War Dancer, Sayaka through a sparrow.

Strike the Blood - 07 - Large 04

Asagi after getting thrown away by the power of Kojou

Asagi saw Kojou using his powers after he was injured by Sayaka. Kojou was unable to control his power and upon seeing Asagi near, Kojou accidentally threw her away where she hit the wall and became unconscious. Then, she was brought by Yukina to the Medical Room, when she woke up, she saw Yukina, Astarte and Nagisa there. She asked about what had happened where Yukina responded trying to quell the situation. Somewhat believing the façade, Asagi asked Yukina what her relationship with Kojou was, to which Yukina struggled to answer. At this point the Black Death Star Faction invaded the Medical Room to abduct Asagi for her intelligence in deciphering codes. Nagisa had a panic attack on seeing the demons but was knocked out by Yukina. Astarte tired to stop them by releasing her familiar but was shot and injured.

The terrorists kidnapped Asagi and company while Asagi is programming all Nalakuvera and brought them in a storage room. The man told Asagi to programmed the strong weapon they called "Nalakuvera", but she refused to do it, but the man told her that if she's not able to do that the man will toast her friends, that's why she was forced to do it even though she doesn't want to. After that, she was able to fixed all of it, while Kojou and others are fighting with the 3 Nalakuvera's. 

While Asagi is programming all Nalakuvera, she finally finish all of it by the power of her speed in programming. After that while Kojou and company are fighting all the Nalakuvera Asagi made something that can make the Nalakuvera stop and be destroyed. After that Asagi's been rushed into the Hospital.

Blazing Angel

Strike the Blood - 09 - Large 11

Kojou wearing Tuxedo

Asagi asked Kojou to go to the Art Club. While the two of them are in there, Asagi asked kojou to go put on the clothes that Asagi gave to him. When Kojou refused to, Asagi said that if he's not going to wear it then she will go change, and once Asagi already is changed Kojou agreed to wear it. When Kojou put it on, Asagi was wearing a maid dress. Then, Asagi took a picture of Kojou. Kojou was shocked and asked Asagi why she did that, Asagi said she wanted to. While Asagi was taking a picture of Kojou, Kojou took his smartphone and took a picture of Asagi and said that it is unfair that Asagi was only allowed to take his picture. Then, at the end of all of it, Asagi took a picture of both of them together.


Asagi took Kojou and her photo

Labyrinth of the Blue Witch

Banquet of the Observers

Return of the Alchemist


Enhanced Hacking Abilities: When Serious, Asagi's eyes get surrounded by a red light, and she shows an enhancement in her hacking capabilities as she was able to decipher the puzzle for Nalakuvera's activation, and could also count as a physical boost, since her finger movement speeds up to such a degree that she was able to hack a whole corporation with just her normal laptop, and while fending off Tank Rider's hacking that's supported by an entire corporation's servers., as shown in episode 3 of Strike the Blood II.


  • The name Asagi means "shallow" (浅) (asa) and "welsh onion, green onion, spring onion" (葱) (gi).
  • Asagi's surname Aiba means "indigo" (藍) (ai) and "feather" (羽) (ha/ba).


  • Asagi's sizes are: B83 - W57 - H82.
  • In the online world, Asagi is a hacker known as the Cyber Empress.
  • Asagi is the Priestess of Cain.

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