Deathco

A story about "Deathco", a young girl who's good at killing, and not much else. She works for a secretive, international league of assassins known only as "The Guild", who infamously dress in costumes when they hunt their targets.

Amazon:

The curtains open for this Comic Noir brought to you by a demon child from the manga world.

The ultra pop dark heroine descends upon this boring bullshit world causing havoc wherever she roams and her name is...
This manga demon child blasts through the conventions of genres and world boundaries as Kaneko Atsushi lets loose a comic that captures the "now" and starts a new Comic Noir series.