Do the Cosmos weep
When a stellar explosion
Leaves all dead and calm
~Naila~
As the challenge goes, this poem is an epic fail. I succeeded with the first rule. I biffed the second and third. Whether I succeeded with the fourth is open to interpretation. I did not succeed at the fifth. The poem does have a deeper meaning, but I doubt anyone will be able to determine what it is.
+ 5-7-5 syllables
+ a seasonword (kigo)
+ a cuttingword (kireji, in western mostly interpunction)
+ a moment as short as the sound of a pebble thrown in water
+ interchangable first and third line
+ a deeper meaning