This is the second prototype chapter to emerge for the manga series. The two proto chapters are completely different and have different concepts for the story entirely. It seems the the series name may have been called 7 Samurais before being named to UQ Holder!. 7 Samurais, of course, is a reference to the film Seven Samurai or the anime series, Samurai 7. There was a reference to this name later on in manga. This chapter was included in the UQ HOLDER! Mahou Sensei Negima! 2 Official Guide & Encyclopedia book.
This chapter is 60+ pages and while it features a few of the same characters, the story set-up is quite different. The chapter has yet to be translated, so it's hard to determine what exactly the story is. -------