My Older Sister Can't Be This Airheaded!

"My Older Sister Can't Be This Airheaded!" is a high quality track exclusive to the album Your Onii-Chan's Favorite Rips!.

Joke
The track plays the instrumental of "Cagayake! GIRLS" by Tom-H@ck, the first opening of the anime series K-ON!. From 0:07, this is mashed up with the vocals from "irony". At the same time, the keyboard from "Cagayake! GIRLS" plays the melody of "irony". The keyboard comes in again at the second chorus at 1:04.