[fanart] The Day of UFO

I heard that June 24 is the day of UFO …

then I remembered an doodle of UFO & Nue (Touhou Project – Touhou Seirensen 東方星蓮船) I have drawn and left in this February.

I have wondered what are the Litchee-like objects often drawn under UFOs pic.twitter.com/2rSRyt7xil

— Aki (@diceproj) June 25, 2015

seriously, what are they ??