Poisoning

Poisoning food is one of the many ways to eliminate your rival or chosen student.

All Yandere-chan has to do is poison a student's food, as long as she has at least Rank 2 in Chemistry, poison from the Chemistry Lab, and the opportunity when her victim is distracted.

When you poison a student in the game, regardless of the student's persona type, any student that finds the body will go get a teacher. The teacher will contact the paramedics instead of the police, and the school day will end. YandereDev has stated that in the final version of the game, other students will notice the girl loudly choking to death instead of just staying still ignoring her.

When the paramedics arrive, they will be unable to revive the student.

Necessary Preparations
However, the only way Yandere-chan can successfully get poison is by having enough Study Points invested in the Chemistry stat.

To be able to poison a student's food, Yandere-chan must first know which exact poison to take from the Chemistry Lab. If you are having trouble finding the poison, you can use Yandere Vision to pinpoint it's location.

The Poisoning
In addition to the June 1st update, on Wednesday Kokona Haruka will break her normal path to sit at the bench on the rooftop to eat her bento. As of the update, only Kokona Haruka does this. Before resuming to eat, Kokona will be distracted by Senpai and will go on to say that she wishes to confess to him on Friday. After talking to herself briefly she will return to eat. In the given time Yandere-chan has, she can quickly poison Kokona Haruka's food.

Trivia

 * YandereDev has mentioned that in future builds, Yandere-chan can poison a student to distracting the Nurse. This will cause her to take out her medicine cabinet key, which is necessary to access the drugs inside.
 * If Yandere-chan hides a poisoned student's body but does not dispose of it by the end of the day, a teacher will still find the corpse and call the paramedics.
 * Poisoning was first added in the June 1st Build.