Hi Hi Puffy AmiYumi: Kaznapped! is one of the most obscure games debuted in 2005 based of the 2004 Cartoon Network show called Hi Hi Puffy AmiYumi, starring, of course, Ami Onuki and Yumi Yoshimura as playable characters.
The download links are from the US, European and Japanese versions.
Note: The Japanese version is called just Hi Hi Puffy AmiYumi, which I think it's pretty confusing because of the show, with the same name.