Okay - I'll explain this gag.

I was trying to find songs done by the Japanese voice actor of Leonardo in the 2003 TMNT series (Tetsuya Kakihara) and I found a song of where he's singing the Cutie Honey theme. (Having a guy sing it is HILARIOUS)

I had a very random thought of Leonardo singing this and NiNi is all confused. Well, aren't we all?

I can't get over NiNi's expression though XDD

TMNT/Leonardo © Mirage Studios
NiNi/Comic ©  nichan
Cutie Honey © Not mine

EDIT: Wanna hear the song? Click here: http://tinyurl.com/cutieleo