Hunting Sins

The seven deadly sins, Wrath, Sloth, Lust, Envy, Gluttony, Greed, and Pride, are all siblings, though most of them don't act like it. They insult each other and refuse to show any love for each other, being that to them it shows weakness. This story takes place from the view of the youngest sibling, Wrath. Wrath doesn't hate any of her siblings, really, she cares about them like they do for her, but she's the one that has the most difficult time treating them all as terribly as they treat others. The sins don't even trust each other to know how to kill them, all they know is that there are different weaknesses and exploits that allow them to die. Soon, there is a man that learns how to kill them. The sins must find out who this man is and how he knows these things before he continues his biblical killings and harms their family.
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Keep in mind that this is not from the Bible, the only thing I'm really using is the sins. The story, the way they act, and how they look is straight from my fucked up and twisted little mind.