| Ayase Koumoto|
|Normal | Yandere|
“If it’s yours, I like any of it!”Ayase Koumoto (河本綾瀬 Koumoto Ayase) is a character from the Yandere No Onna No Ko Drama CD 1.
Ayase was a childhood friend of the Protagonist, and his current girlfriend. She harbored romantic feelings for him since they were young, and wants to marry him in the near future. However, she becomes envious and obsessed with eliminating her “love rivals” in order to prevent her dream from going to turmoil.
The Protagonist ate at Ayase’s house, resulting in Nagisa becoming violently envious. Because of her envy, she murders both Ayase and her brother.
Ayase is currently dating the Protagonist. She has him visit her house and cooks for him as she washes her hands, soaked in blood. She then starts remembering her childhood with the Protagonist and how she used to defend him from schoolyard bullies. However, she realizes that he is grown up and doesn’t need her protection anymore. In spite of that, she's happy that they're dating, albeit being jealous of Nagisa and Sonoko. She tells him that Nagisa went to Ayase's house, and after hearing the doorbell, Ayase goes to back to her house.
When she returns, she sees the Protagonist frightened, realizing what happened to Nagisa. Ayase feels betrayed, so she bludgeons him with her hammer, leaving him unable to flee. She then reveals that she murdered Nagisa and Sonoko in a fit of jealous rage. The Protagonist starts crying in terror, so Ayase decides to console him by feeding him food. Instead of using a fork, she feeds him with a knife, which ends up hurting his throat. He begs her to save him, but she misinterprets him, thinking that he's asking her to save him from any other girls that she believes will take him away. What happens later is left ambiguous, but it's assumed that she forced him to be with her, and tortured him..
Sonoko misapprehended how kindly the Protagonist was treating her, thus deluding her into believing that they're dating. She becomes jealous of Ayase, so she then confronts her. Ayase tells her that the Protagonist is her (Ayase's) boyfriend and warns Sonoko to leave them alone, but Sonoko kills Ayase with her shovel. She later caves inside her corpse in order to use it as a flower pot.