The title is actually a portmanteau of the words "Friend" and "Ranger".
The B-side track, "Amai Kimochi Maru Kajiri", was used in a Music.jp CM.
"Frienger" debuted at #2 on the Oricon Weekly Singles Chart with 70,414 copies sold.
It maintained high sales for the following two weeks and sold a total of 173,115 copies in 2006.
All tracks are written by Ai OtsukaOricon Sales Chart (Japan)