Sanity



'Sanity is a key element in Yandere Simulator''. It shows how much of Yandere-chan's true nature is revealed.'''

If Yandere-chan performs an unethical action, her sanity will decrease. In order for her to become completely insane, she will have to do these actions several times.

When Yandere-chan is visibly insane, her head and arms will be twitching, her back will be slightly hunched over in a menacing state, her eyes will open wide with the pupils appearing blank, and a shadow will loom over the top half of her face. The music will become distorted, and have a far more threatening tone than the usual chords. In the future, Yandere-chan's murders will get sloppier and take longer to commit the lower her sanity is.

Decreasing Sanity
The ways to decrease sanity are:
 * Drowning someone (-20%)
 * Homicide (-20%)
 * Tranquilizing someone (-20%)
 * Pushing someone off a roof (-20%)
 * Dismemberment (-20%)

In the future, immoral actions such as lying, stealing, trespassing, and taking panty shots may lower sanity as well.

Cardiograph Monitor and Sanity
The cardiograph monitor displays current heart rate which reflects sanity. It is located at the bottom-right of the HUD. While having high sanity, the cardiograph monitor will be pink, with the spikes appearing every second or so - a normal, calm heart rate. When fully insane, the cardiograph monitor will be a bright red, with the spikes appearing in quick succession, showing that her heart rate is erratic.

80 % Sanity
Yandere-chan becomes 83% sane after kidnapping or killing one NPC. Her heart rate becomes a bit faster and her head starts twitching slighty. A shadow begins to appear over her eyes.

60 % Sanity
Yandere-chan becomes 66% sane after killing two NPCs. Her elbows become slightly bent and the shadow becomes a little bit darker. Her pupils become blank.

40 % Sanity
Yandere-chan becomes half-way insane after killing three NPCs. The shadow starts to appear appear more visible. Her pupils become more blank. The background music becomes distorted in pitch.

20 % Sanity
Yandere-chan becomes 33% sane after killing four NPCs. The cardiograph monitor shows her heart rate in red, light gray vignette appears at the screen's corners. Yandere-chan's back becomes hunched. The shadow over her eyes becomes even darker and her pupils are almost blank. The music becomes extremely distorted, and out-of-tune pianos play in the background. It can be heard here.

0% Sanity
Yandere-chan loses all of her sanity after killing five NPCs. Her heart rate becomes extremely erratic, her eyes' pupils are completely blank, and the shadow over her eyes is extremely dark. The game screen is covered with a gray vignette and the game camera starts to shake.

Reactions of NPCs
If Senpai or a teacher sees Yandere-chan being visibly insane, then it will result in a Game Over (Senpai giving the "Heartbroken" Game Over and teacher giving the "Expelled" one).

Meanwhile, if a student sees Yandere-chan in this state, it will instead lower her reputation by ten points if School Atmosphere is high, fifteen points if School Atmosphere is medium, or twenty points if School Atmosphere is low. Apologizing to those who saw the lack of sanity will get 50% of the reputation points back, or 75% if the player wears the Kawaii Moe Shimapan Panties. If a friend or a seduced student sees Yandere-chan, her reputation will be affected by eight points instead. If the player is in the Occult Club, it will take longer for students to notice the insane player.

Low sanity is also incriminating evidence for the police, so if the police come to school they will take in Yandere-chan for acting suspicious. They will question her off-screen until she finally admits to her crimes.

Yokai Story

 * Main Article: Yokai Story

There are five manga volumes scattered around school named Yokai Story. The player can only read one each night. Reading these manga volumes will increase Yandere-chan's numbness level, a skill that changes how long it takes to become fully insane. Level 0 (Stoic): It takes five murders to become fully insane.

Level 1 (Somber): It takes six murders to become fully insane.

Level 2 (Detached): It takes seven murders to become fully insane.

Level 3 (Unemotional): It takes eight murders to become fully insane.

Level 4 (Desensitized): It takes nine murders to become fully insane.

Level 5: (Dead Inside): It takes ten murders to become fully insane.

Occult Club

 * Main Article: Occult Club

If the player joins the Occult Club, then the player's sanity will decrease at 50% of the normal rate (e.g. it will take ten kills to become fully insane rather than the usual five). If the player leaves or gets kicked out of this club, then these benefits will no longer be active. If these benefits are combined with Yokai Story, it will take twenty kills to become fully insane.

Tiny Thong Panties

 * Main Article: Panties

If Yandere-chan wears the tiny thong panties, then her sanity will decrease at 50% of the normal rate (e.g. it will take ten kills to become fully insane rather than the usual five). If these benefits are combined with Yokai Story and the Occult Club, it will take thirty kills to become fully insane.

Restoring Sanity
In order to restore sanity to normal, the player can:
 * Laugh hysterically. To do this, tap the Control (PC) or RB (controller) button repeatedly. It's a Game Over if a teacher or Senpai sees Yandere-chan like this. If others hear this sound, it will lower reputation as of the September 1st, 2015 Build. Laughing in the future can cause students to investigate the source of the sound, leaving the target isolated.
 * View pictures of Senpai. To do this, first take pictures of Senpai using Yandere-chan's phone. Next, press Enter (PC) or Start (controller) button and navigate to the photo gallery. Then, select the photo(s) Yandere-chan has taken and "use" it by pressing R (PC). 1980s Mode will not feature the use of the phone.
 * Stand near Senpai's pink aura, though getting noticed will eventually result in a Game Over. If the player is in the Occult Club, then Yandere-chan can stand near Senpai longer without being noticed.
 * Pass the time with the phone. 1980s Mode will not feature the use of the phone.
 * In the future, the player may be able to paint a picture of Senpai to regain sanity when in the Art Club.
 * In the future, the act of being dragged to the Counselor's Office will restore sanity to normal.

Homicide
YandereDev has stated that sanity will have harsher consequences in the future and must be considered in the player's strategies. In the future, killing animations will be determined by the protagonist's current level of sanity.

High: Kills will be efficient, quick, and silent. They will take two seconds.

Medium: Kills will be sloppy, messy, and noisy. They will take four seconds.

No sanity: Kills will be long, brutal, and sadistic. They will take six seconds.

Crawling
Crawling may become less subtle depending on the protagonist's current level of sanity.

High: Looking for dropped contact lens (not suspicious)

Medium: Crawling (suspicious)

No sanity: Dangerous Animal Pose (very suspicious)

Student Sanity
As of the October 17th, 2015 Build, students will also have sanity, which is normally at 100%. However, the main character is able to decrease their sanity when she tortures them in her basement. They will also twitch and have small pupils when their sanity is low. If their sanity is at 0%, then the player can bring them to school and give them a weapon to perform a murder-suicide with the current rival of the week.

Senpai Sanity
Senpai has a hidden sanity variable that will influence some of the game's endings and possibly influence some of his everyday actions. If Senpai's sister is killed, the Senpai sanity variable would take a big hit. The effects of Senpai's sanity are dependent on budget and volunteers. Yandere-chan is okay with mentally traumatizing Senpai in order to eliminate a rival.

Depending on Yandere-chan's actions, Senpai might develop PTSD, a personality complex, a nervous disorder, or social anxieties.

Trivia

 * If the player tries to frame a student while having little to no sanity, the police will arrest them both.
 * As of October 2015, Yandere-chan's insane laugh is over eighteen months old.
 * YandereDev has stated that a more accurate measurement would be composure rather than insanity, as Yandere-chan is insane 100% of the time. However, she hides it until murderous deeds cause her true nature to show.
 * In the animation of third degree laughter, the player can see the animation of Yandere-chan's pupils dilating to return back to usual.
 * YandereDev has revealed that he will nerf laughing to restore sanity "once other methods are implemented."
 * In the very old pre-debug builds, instead of a cardiograph, there was a grey meter of a human. After every yandere action, the meter became more red, showing how much sanity has been lost. There was also a face cam of Yandere-chan's eyes. After every Yandere Action, her eyes became more dilated and her smile bigger. These two HUD functions were later removed.
 * The old Sanity meter was called the Yandere Meter, as seen in a YandereDev video Yandere Meter Gameplay.
 * YandereDev may implement hallucinations if Yandere-chan's sanity is low. Outdated HUD - 2.png
 * The original Sanity Meter was located on the bottom right corner, slightly skewed.
 * There were two previous animations for the insane laugh that have since been removed.