The only thing I know about the Popotan game is that 2 of the main characters from the OP were used for the
Caramelldansen video meme. The anime was pretty boring though, I think I watched about 4 episodes before giving up on it.
Zero no Tsukaima 8:
Character development for Tabitha. Meanwhile, back at the school, fun with love potions.
Zero no Tsukaima 9:
Story progression here, apparently. I'm guessing the Ring of Whatever is going to be important. Another mention of the strange runes on Saito's hand.
Both 8 and 9 have very very brief foreshadows at the end of each episode, presumably leading into the main story to come, because they sure went out of their way to make it look all ominous.