After returning to the main storyline in the last episode, this week's episode takes a calm break from the action as Negi and his Ministra Magi get some "camping" experience. However, to say that this is a filler episode is wrong, since a lot of story-related events do happen, including:
-Takahata and Konoka's grandfather discussing how the Star Crystal is now in Japan;
-Negi and his Ministra Magi confronting the mysterious masked villain once again (with the villain throwing a rose at Negi and his crew a la Tuxedo Mask);
-Negi's Ministra Magi receiving training wands so that way they can learn magic too (an element lifted from the Wilhelm arc from the manga).
Also, when it comes to the main story, Negi makes his seventh Pactio, this time with ninja girl Kaede. While the Pactio was definitely unexpected compared to the other Pactios made so far (considering how Kaede, even though the episode focuses on her, had little screen time in the episode and the fact that the episode title doesn't even hint that a Pactio will take place), it's definitely a smart move to make Kaede a Ministra Magi in the new series, given her closeness with the twins and the fact that, in the manga version, I feel that Kaede is like a "secret bodyguard" for Negi. Besides, given that some of the Pactio activations involve nude henshin sequences, I'm sure that Kaede's henshin sequence will cause a lot of nosebleeds.
Outside of the main story, there's also a funny subplot where Yuuna admires one of Mana's guns (with the cheerleaders noticing it), and it looks like the Makie/"frog plushie" subplot from last week's episode is continuing in this week's episode (with Makie proving that Negi's Ministra Magi aren't the only ones who can have nude scenes in the new series).