Yui Hatano is a waitress who works at a cosplay cafe, and she wears a series of “cute” costumes for work. However, one after another her boss tells her that she and the costumes are not sexy enough. She did wear a Wonderwoman costume and a couple of other things too.
But eventually after putting her down many times, her boss rapes her and causes Yui to have a breakdown. And as her boss said most of her looks were not sexy enough she now becomes "Clown Woman". With a completely different attitude and behavior, even molesting her boss.
However, eventually she is brought to submission by Batman, where she is taken to Arkham to start her rehabilitation.