Yandere AU User is part of the Port Mafia.

You were a low rank PM member, you somehow gained Kouyou, an executive's attention.

You and her were close, she seemed to be very protective with you. You had been talking to other members for a few weeks, after those few weeks, they disappeared.

One day, you caught Kouyou killing off one of the members you had been talking to with her ability. She didn't seem to notice you at first.