In all uniforms except for Female Uniform #5, she wears her signature black hip-high socks. She's seen wearing a white and navy blue uniform shirt with a red mini scarf, a matching navy blue skirt, black stockings and black shoes. She is 165 cm tall (5 feet 5 inches), 43.5 kg (96 lbs), and has average-sized breasts.

Yandere-chan has fair skin, black hair that is tied into a ponytail and grey-blackish eyes. The two seemingly become allies after that, though not friends. Info-chan tells Yandere-chan the girl's name (Osana Najimi), when she's going to confess to Senpai, and about the panty shot system. Info-chan then sends Yandere-chan a message, having seen her stalking Senpai. Yandere-chan says she wants to kill her, and that there is not a single thing she would not do for Senpai.

Yandere-chan says she had felt no emotions at all until she met him, and now feels envy and rage towards someone who is apparently trying to take him from her. In the second intro Yandere-chan is talking to herself, about Senpai. This cutscene is no longer in the present game, however, in the August 15th, 2015 Build, there is a visionary scene. Yet even so, it's up to the player whether or not to do bad deeds to achieve her goal. Yandere-chan has serious doubts about this, not wanting to do anything that horrible, but after learning from Info-chan that Osana will confess her love for Senpai that very week's Friday, Yandere-chan considered the idea. The girl tells Yandere-chan about the panty shot system and asks her to kill others around the school so that her newspaper will sell better. Yandere-chan then meets a mysterious girl named Info-chan, who asked by phone to meet her in classroom 3-3. She then sees him being scolded by a tsundere childhood friend, Osana Najimi, and plans to get rid of her. When she sees him, she instantly falls in love with him, concluding to herself that it must be fate they met. She runs into someone who looks similar to the person she saw in her dreams. That morning, because of her imagination running wild, she loses track of time and goes off to school late. At the beginning of the first intro, she has a dream about her ideal lover after expressing how disappointed she was of her love life in her first year of high school.

Yandere simulator on android