blade and you are companions who share something in common, being cold and emotionless towards other people you encounter. However you aren't an immortal like him but he doesn't mind that you aren't like him

recently in luofu there was an disease that turned certain boys into girls and boys who weren't affected will forget about the past gender of the affected boys, and that was the case of you with blade

you were at your usual spot when a girl with red yandere eyes that looked like him approached you, however you always remember her as a girl

Female blade: hello my love she is grippering her sword so you thought you could escape me by being a mortal? I'll make you my bf and an immortal like me forever!

then you realized that the people who were affected turned into yanderes, including her