Saki Miyu wears the default female school uniform, unless customized by the player.
She has cyan colored hair with short bangs in front of her face. The rest she wears in two long pigtails. Her eyes are cyan as well. She has fair skin and the second largest bust size in the game, at 1.7.
Among the personas currently implemented in the game, she is a Social Butterfly. She cannot fight back if attacked. If she witnesses a murder or sees a corpse, she will run to a largely populate area to call the police. During lunch at the rooftop on Monday, she will talk with Kokona Haruka about her "situation" with her father at home. Saki is presumably compassionate and an understanding friend and will only show concern for Kokona.
She may be a bit lewd, because for her task, she'll ask Yandere-chan to retrieve a bra that she lost. Saki seems very embarrassed about the bra and the story about it will be revealed in a future update.
If Saki hears about Kokona's compensated dating, she will be surprised. It is never shown for her to go and care for Kokona when she gets bullied, so it's possible that Saki isn't the great friend she made herself out to be. The Dev might add her comforting Kokona, but there may be a limit. If Kokona's reputation is bad enough, Saki's may go down too and she would have to avoid the rival.
At 7:05 AM each day, Saki Miyu will enter the school ground third in line on the right to school. She walks to her locker at 7:10 AM. At 7:15 AM, she will walk to the plaza, on the left side of the fountain, to gossip.
At 8:00 AM Saki will walk into Classroom 3-1 and sit in her desk. She will start class at 8:30 AM, and leave to go to lunch at 1:00 PM.
On Monday at 1:00 PM, Saki will talk with Kokona about her "situation" with her father at home on the rooftop. Yandere-chan can listen in on the conversation, but Saki and Kokona will stop talking if they notice Yandere-chan. This is the only special event she has. During the rest of the week, she gossips with her group during lunch.
Saki walks to class again at 1:30 PM and will finish second period at 3:30 PM. She will then go down to her locker and later linger there until 3:50 PM, when she walks home.
On Monday from 3:40 PM to 5:30 PM, she will eat octopus-shaped hot dogs with the other female students in the Cooking Club. At 5:35 PM, she walk to her locker and stand there before leaving the the school buildng at 5:45 PM.
She is the only student who currently has a task. Saki is currently the only student that can be befriended because of this, but since the implementation of Seduction, she is not the only student who can do favors for Yandere-chan.
If Yandere-chan asks if she can complete any tasks for Saki Miyu, she will ask Yandere-chan to find her bra. The bra is cyan, like her hair and eyes. When Yandere-chan retrieves her bra, she will become her friend.
According to her Student Profile, Kokona Haruka is Saki's best friend and closest confident. Kokona is willing to discuss personal matters with her, such as during the rooftop conversation about her "situation" with her father on Monday. When you talk about Kokona's compensated dating on the internet, Saki Miyu will be confused and distraught.
YandereDev said that Saki might comfort Kokona, but there would be a limit to that if Saki gets hurt because of it.
- She is voiced mainly by Hayden Daviau-Hunt and shares her with Kokona.
- However, she was also voiced by Mom0ki in the October 17th update.
- Her name is a reference to the most popular female Japanese name in 2012, 9th most popular being Saki, 10th most popular being Miyu.
- When YandereDev was struggling to find hairstyles that he could create by duplicating and changing the size of a ponytail, the last idea that he came up with was "two long twin tails". He made them cyan because they reminded him of Hatsune Miku. 
- Saki Miyu's character links to Hatsune Miku further, coincidentally. While visually she does resemble Miku, Miyu also sounds very similar to Miku and Saki is the first name of Hatsune Miku's voice provider, Saki Fujita.
- In older versions of the game, Saki Miyu's name was Azu Naka. The placeholder name was inspired by K-ON.
- She has the second largest bust size in the game (1.7), the first being a tie between Kokona Haruka and Mai Waifu.
- Her counterpart is Sora Sosuke.
- By opening the debug menu and pressing the "M" button, Saki Miyu becomes brainwashed without needing to kidnap and torture her.
|“||Well...actually...there is something that I need help with...This is ...really embarrassing...but...well...I lost...my bra...somewhere at school...and I can't find it anywhere... D...Don't ask me why my bra is missing! It's a long story, okay? The point is, if you find a bra lying around, it's mine, and I would really appreciate it if you'd return it to me! Oh, god...this is so embarrassing...||”|
— Saki asking Yandere-chan to find her lost bra.
|“||You'll look for it? Thanks! I hope you find it...||”|
— Saki after accepting a quest
|“||Ugh...why did I even bring that up...||”|
— Saki after denying a task
|“||Yes! You found it! Thanks a lot - I owe you one!||”|
— Saki after Yandere-chan returns her bra.
|“||You haven't been acting like your usual self lately. Is something bothering you? If you don't want to talk about it, that's fine...but remember...I'm your friend, and I'd never judge you for anything. I'm listening. What?? That sounds really serious! What does your dad do? You haven't anything to be ashamed of! Just tell me what's wrong! If you say so...but now I'm really worried...||”|
— Saki during her conversation with Kokona in the rooftop
|“||...no...Kokona-chan...it's not true...is it...?...||”|
— Saki Miyu on the internet
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