Well, without more specific information, it's hard to say exactly. It could be a fictional story where a particular day is filled with wrath. Maybe it's a day when a character or a group of characters face the consequences of their wrongdoings. It could also be related to a natural disaster that occurs suddenly and is seen as an act of wrath from nature or some higher power.
The 'day of wrath story' might be a tale that centers around a day of fury and retribution. In many stories, such a day often brings about a turning point. It could be a day when long - suppressed emotions boil over, leading to chaos and upheaval. In a historical context, it might refer to a day of a major battle or a social revolution where the wrath of the oppressed against the oppressors is finally manifested.