NOTHING
In the story "O Perfect Day" by Estrella Alfon, the characters are Lucio, the husband, and Corazon, the wife. They are a married couple living in a small village in the Philippines.
No, although "on a perfect day" could be an adverb prepositional phrase. Perfect is an adjective and day is a noun.
At the End of a Perfect Day was created in 1977.
On This Perfect Day was created on 2009-08-28.
A Perfect Day for Bananafish was created in 1948.
A Perfect Day - film - was created in 2005.
When everything is perfect.
Doing everything important and have the whole day off to have the perfect day.
christmas day
one perfect day by little heroes
Another Perfect Day was created in 1983-02.
This Perfect Day - song - was created in 1977-05.