for me it's:
Nazotoki wa Dinner no Ato de (I don't how, but I managed to finish it. But, my lord, it was so repetitive, every ep looked the same)
Misaki number one (I was there like... urgh borring.I'd rather look at Gokusen, it's exactly the same, and Gokusen is funnier)
Heartstrings (well, no comment, it was so loooong)