You're gonna go down in history, pal.

The word ephemera is from Greek and means "something that only exists for one day".

Well, there's one thing I'm wondering about, tho'.

Because of that, "kagerou" also means "mayfly". This little bugger's scientific name is Ephemeroptera...

But being a shot type for the main character is a good chance to rise in the ranks, y'know?

A shadow youkai solving incident after incident with the Hakurei shrine maiden!

This state you're in is a pun on "Kagerou", right?

What the word "kagerou" usually means is "heat haze".

Besides an optical phenomenon caused by heat, it often gets used as a metaphor for "fleeting".