Here's the general gist of this comic:
(the girls are all 4 years old)
Mami: Look, Madoka-chan, this is Kyubey. I made a contract with him!
Kyubey: Madoka, make a contract with me too and become a magical girl!
Madoka: Mami-chan, what's a "contract"?
Mami: I dunno, but if you make one you get to make a wish!
Madoka: A wish... (dreaming of a giant cake) I'm gonna make a contract~
Homura: NO! Madoka can't make a contract, because she's supposed to play with me today!
Mami: Aw, Homura made Kyubey cry.
Sayaka: Hey Homura, you made Madoka cry!
Homura: Aw, I just wanted to play with Madoka.
Kyouko: A ha ha ha ha, what are you guys crying about? (she then says something I don't understand which cheers everyone up) I'd rather see your face laughing than crying.