Okay, dipshit. Heres a little lesson for you. Lets call it...Yandere 101
We follow a set of VERY important rules to deal with a yandere with the possibility of lowering casualties.
Rule 1: Never turn down a yandere. At first, you will heavily consider this option. That is bad, this will lead to more deaths, more pressure, more fear, and even more crazy shit happening. Never turn down a yandere.
Rule 2: Manipulate your yandere. Say that your yandere is jealous, or feels that your relationship with them is in jeopardy. They tell or send you a message asking if that person is a threat to them. ALWAYS SAY NO. Don't just say no, convince them. Manipulate their intense obsession with you to make sure they NEVER harm that person. For example: "If you kill or hurt them in any way, I'll never forgive you!"
Say that instead of "If you kill or hurt them in any way, then this relationship is over!"
That will only confirm to your yandere that the person is indeed a threat, and will resort to kidnapping or drugging you. If you say "Ill never forgive you" It'll not only confirm to them that the person isn't a threat, they'll be more willing to accept due to the choice of wording. It doesn't sound like a threat, it doesn't sound like your trying to manipulate them, and its safer. If your a beta MC who has a "I don't wanna manipulate her!" personality, then basically you will never be able to handle your yandere. Unless you undergo massive changes in your views of that person, then you, 100%, either be killed by your yandere or they end up keeping you in their basement as they go around happily plunging knives into the heads of your friends and family.
Rule 3: It is imperative that you have some way to defend yourself to any attempts on your life by the yandere. That will always be a risk. An alarming amount of yandere's had an "If I can't love you, no one else will!" mentality going on. So if you ever find yourself in these situations have a non-lethal (or lethal, it really goes down to personal preference) weapon on you. A good one is a stun gun. It cant jam up and reloading is relatively easy. If you manage to hit the yandere, but they won't go down, then I'd at least buy you time to escape and reload in case of a second encounter.
If your yandere DOES go down, restrain her. Use whatever. Rope, tape, flex tape, wire, that plastic shit that's hard to take off, anything. Just make sure that they CANNOT, under any circumstance, be able to get up or move.
Rule 4: Always try to find your yandere first. This is usually difficult, but it wouldn't be if the MC had a damn brain. Usually, a yandere will reveal themself quite easily. To be in fact, they would be the one finding YOU instead of the other way around. After that, accept their feelings and perform the previous rules.
Unfortunately its 1 AM and im too tired to write the rest of the rules. So figure the rest of it out, I've given you at least a 50% chance of survival if your yanderes the usual lovesick type.