Kasuka doesn't meet Ruri in the anime, so there's no episode, exactly... However, they meet in Volume 4 of the light novel series.
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He meets most of them in the 1st one. He meets team gai in episode 10 and team 8 in epiosde 34 or 35
There is no such episode because Prue and Paige never meet in the show.
Naruto meets Sai right after returning from his mission to save Gaara. In the manga that would be book 32.
He meets her in episode 246. She tells him the story of his birth over the next two episodes.
Well Ginga meets his dad like on episode 45 or 43 either one ,but it definitely on the 40.