Chained by devil

Petra's past

Police siren could be heard from distance, Levi arrived infront italiano Cafe where he and Petra had first date

He walked to crime scene next to his boss "what happened?" Levi asked looking at dead body infront him "we don't know it looks like there was fight before victim was killed" Erwin answered

Levi scanned  person dead body before asking "did you find any object that could be the cause of the murder?" Erwin shaked his head "looks like our killer is really smart then...any imprint?"

"No...he or she wore gloves so it's pretty impossible to find any imprint on body.." Erwin answered and then looked at others

"Alright everyone let's go to police station to re-examine this case" everyone nodded, they got into cars and went to station not knowing someone was watching them

Dark figure start chuckling "that's what you get for talking about my boyfriend..you're next Mikasa Ackerman.."

-yesterday-

Petra was walking home still angry at Mikasa

"How dare that bitch kick me out of the house like that" she mumbled before she heard two women talking

"Did you saw how hot officer Ackerman is?" Other girl had hearts in her eyes "yeah, it's shame he's taken, we would look so hot together" she giggled

Petra's heart started filling with jealousy, she send glares to girls but they didn't noticed

'damn it I can't go and kill her now...I must wait until that bitch is alone' she thought and continued walking to pass some time

-20 minutes later-

Both girls said goodbye and walk in different direction

While girl was walking a dark figure attacked her snapping girl from her thoughts

Girl dodged figures attacks but that didn't last long because girl triped and fell on the concrete

Figure stabbed her into arm, girl screamed in pain

Then she got stabbed again and again until she couldn't fight anymore

Girl was almost dead when she asked in whisper "w-who are you?" Figure smirked and put down her hood

"P-Petra Ral" Petra smirked "you guessed"

"B-but *cough* why?" She coughed blood, Petra was looking at dying girl "you talked about my boyfriend, that's why"

She chuckled "since you saw my face I guess I have to finish you before you tell someone who tried to kill you"

Girl tried to scream but it was too late because she was already stabbed in chest and start bleeding all over cold concrete 

-now-

Petra was at home looking at picture of Levi

"You only belong to me and only me my dear Levi!" She said hugging picture, she remember her first time she met Levi and her first victim and of course other things

-12 years ago-

18 year old Petra was thrown against locker, hitting her beck pretty hard on cold and strong  metal

5 girls surrounded her "look who we have here, isn't that Petra the loser" girl with white hair said as other girls laughed at Petra

"What do you want Rico?" She asked with groan from pain "I'm here to give you warning loser, stay away from Levi-kun or we might torn you a part"