The story revolves around psychiatrist, Harleen Quinzel, as she falls in love with her patient, The Joker, the which shares stories of his dissent into madness as he transforms into the criminal mastermind that he is today.
The story is a prequel to...
On the next therapy session everything's going normal, Harleen and The Joker talk and talk for a while.
The Joker: *leaning in* "Tell me something darling...have you ever had a bad day?" ____________________________________________________________________________
*THE PAST*
That same day Wendy died, J is on his way to the bar meanwhile he has to walk through the streets then stops and looks at a poster on the wall, the poster shows a man.
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The poster reads: "Harvey Dent for District Attorney"
J then rips the poster and throws it on the floor as he believes that Harvey Dent was lying to Gotham City about keeping it safe, it was bullshit; Gotham City had no hope.
So at the bar, J is with two of his "friends", Richmond and Marv, who are gangsters.
J: *depressed* "I get kicked out of the stand-up bar, get played by some bastards, and my friend died"
Marv: "Damn, your life sucks, but we will take care of you"
Richmond: "We need your help getting through that chemical plant you used to work at"
J: "The chemical plant?"
Richmond: "Yeah, they say your ex-boss has a lot of money there, we figured that you can sneak us in, you can also get money for yourself"
J: "I don't know, it's too risky"
Richmond: *taking out a briefcase* "Nonsense, look, to protect your identity you'll be wearing this"
Richmond opens the briefcase, it is revealed that what's inside is a large domed red helmet and a red cape.
J: "That's the Red Hood's mask! Are you guys the Red Hood?"
The Red Hood was known in Gotham City for being a criminal.
Marv: "Grow up, there's no Red Hood, it's not real, it can be any normal bastard wearing the helmet and cape, so what do you say?"
Richmond: "Think of it, if we get that money, we can be as rich as a crime lord from Hell's Kitchen, New York, what's his name? I think it's Michael Corleone"
J: "Hm...if I do it, I'll have a proper life, and bury Wendy in luxury"