Yandere Girls Wikia
Ayase Koumoto
Kanji 河本綾瀬
Occupation Student
Weapon Hammer
Series Yandere No Onna No Ko
Voice Actress Ryou Hirohashi

Ayase Koumoto is one of the girls from Yandere No Onna No Ko. She was available in the first CD.



Ayase is a tall and well developed girl with fair complexion and big blue eyes. Her pink hair is medium-length and worn in a high ponytail held by a purple ribbon. Her thick bangs have an intake at the center and her short, choppy forelocks are shoulder length.

She is only seen wearing her school uniform, a light yellow and brown blouse with green collar, sleeve cuffs, and pleat skirt. On the chest is a red ribbon, and she wears black stockings.


Ayase is outgoing and friendly, she has no problem speaking her mind. For those she cherishes, she is very protective and takes a proactive role in their life to help them as she sees fit. She's a great chef and is known for her talents in the kitchen. She cares a great deal for the Protagonist, even if she might not act like it at first.

Over the years it is revealed she has become paranoid over the Protagonist due to her relentless desire to keep him safe. She flawlessly covers it up with a mask of perkiness, but she puts little thought into her actions and has become careless. She has a sadistic side that comes out whenever causing physical pain.


Ayase is the childhood friend of the Protagonist and has always been right next to him. Initially she saw herself as nothing more than someone looking out for him, but she came to terms with her feelings as they began growing. She made a confession to him sometime later but was apparently rejected. 

At the start of the track they appear to be dating, but she is becoming bothered as of late noticing that he still thinks about other girls and hasn't been relying on her as much.


She is shown using household items, such as a hammer, scissors, and knife.


Protagonist - Ayase panicked after the Protagonist realized she killed Nagisa, having been covered in her blood. To stop them from escaping she struck their hands and legs with her hammer, followed by other parts of their body. By this point she realized how much she liked listening to them scream and continued hitting the Protagonist until their body was in too bad of a shape to move any longer. She proceeded to take care of the protagonist and torture them for the remainder of their life.

Nagisa - She originally had no intentions of harming Nagisa because of her relationship with the Protagonist and not seeing her as a threat. But when Nagisa confronted her, Ayase angrily pulled her into her home and beat her up in her bedroom, which was soundproof as she practiced piano inside.Nagisa tried to escape, leading Ayase to repeatedly stab her.

Sonoko - It was noted that she vanished a few days prior to the track. Ayase reveals that she confronted her to demand that she stay away, but when she refused and tried to hurt her, she retaliated by murdering her with a pair of scissors.


Protagonist - Initially Ayase thought the protagonist was just a whiny child who got on her nerves, but she was very attached to him. She feels very lonely without him around and her desire to be needed by him is what causes her grief. She attempts to get the Protagonist to believe they are a couple during her track.

Nagisa Nonohara - Ayase feels she should settle for being the Protagonists sister, and is fairly envious of their bond and how they live together, allowing Nagisa to see sides of him that she does not get to. She has a natural rivalry with Nagisa due to them both being similar in behavior and skill, but she didn't think of her as any real threat.

Sonoko Kashiwagi - Ayase bullied Sonoko with no remorse, calling her plain and ugly, saying she wasn't worth the Protagonists attention. Her irrational hatred of her worsened after the Protagonist came to her defense.


Nagisa's Track[]

Nagisa confronted Ayase under the belief she had impure intentions and stabbed her to death (along with Sonoko) shortly before the track takes place.

Sonoko's Track[]

After being confronted by Ayase the girls attempted to resolve things, but Sonoko gave in to her rage after being insulted by her. Using her planting shovel she stabbed her in the stomach and used her corpse as fertilizer for her plants.



"But... when did we stop going together? When I noticed, you were all grown up and taller than me and I couldn't protect you anymore. I felt a bit lonely."


"I just killed her, and she still bugs me!"


  • Her voice actress also voices another yandere from the series, Yumemi Takanashi.
    • Both girls have similar appearances and personality traits.
  • She is 160cm tall.
  • Her measurements are 89-58-86.
  • Her yandere type is Possessive.
  • Ayase is the only girl in the first drama both rivals had an extreme problem with. This is due to her long-time connection with the Protagonist, and the fact that she was seen as being "better" than Nagisa, and bullied Sonoko. 
    • She is also the only girl in the series, because besides the twins, none of the other girls personally know the others/their victims.