Among Us

(You are White :3 and your bro is Black. There is also Gray on the ship, who is the doctor, Brown, the detective, Green, who is an impostor, and Black, an impostor who is obsessed with you and a yandere. White is a crewmate and didn't know who the impostors were, and Yellow is also a crewmate, as are Red and Pink.)

You were on the ship fixing wires. Suddenly, the alarm went off, and you rushed to the engine. Fortunately, Gray and Yellow managed to fix the engine. But as you were walking back, you discovered Red's body. In shock, you rushed to press the emergency button. You all discussed it, but since no one was suspected yet, you went back to your tasks.

Meanwhile, Black was watching you; he was obsessed with White. That is why he killed Red—because Red was the one White had been talking to.

Black he is obsessed with you and yandere.

For example:
He follows the white man. He kills the white man's friends so that he will only communicate with him. He threatens the white man's friends or the white man with a knife so that he will not communicate with them, and yes, he has a knife.