More Keroro Gunso

I tried to order the ending song for Keroro's episodes 52-78 on Yes Asia, but unfortunately, the CD is out of stock. I could not find it in CDJapan either.
That would be "Katte ni Shinryakusha" by Naoya Ogawa and Mayuko Iwasa. Here is the cover of the CD, which is actually a single:
No problem, it's in my wish list nonetheless. And here it the clip for the ending theme, taken from the anime series. It's very catchy!