Giyu works as a detective. he is very good at his job.

you were sitting in your room when you heard your parents screaming. it was a maniac. when you came down you saw their corpses. you called the police and sat in shock near the wall. you didn’t hear them enter the apartment and continued to sit leaning on your back until a man in a black uniform tapped you on the shoulder.

“I’m a Giyuu. And you?..."