Does it have to be real or can you make it up

Aw... I had an idea but it was made up :(

Okay so There’s this person, they are a serial killer, after killing their victims they eat them to take away all evidence of the crime. Later on the police get suspicious, they go over and inspect the person. The person makes sushi out of their most recent kill, after the police eat it they go up and whisper that they had just ate the victim, shooting the police while whispering.

u-u

Wait imma re write that-

There’s this person, they are a serial killer, after killing their victims they eat them to take away all evidence of the crime. Later on the police get suspicious, they go over and inspect the person. The person makes sushi out of their most recent kill and serves it to the police, after the police eat it they go up and whisper that they had just ate the victim, shooting the police while whispering. The killer is still in the loose years later, they fall in love, turns out the person they fell in love with was a spy, but the spy ended up actually falling in love with the killer and isn’t able to let them go to jail.