Fruits Basket - s01e22 - Because I Was Happy.
I kind of hoped that Hanajima's history would pop up sooner than later. Thus making an episode filled with more than a bit sad and some good humor as well.
The role of Tohru and Uotani in the story, strikes me as showing their essential natures without losing the episode's focus on Hanajima. If you want a good story: the characters are where it's at.