Given the subjects of several of this series previous story arcs, it was only going to be a matter of time before the urban legend that is the "Level Upper" came to the forefront of To Aru Kagaku no Railgun's attentions, and so it is that this eighth episode takes us down this exact path.
Discussion of said legend originates from Kuroko's musing over recent cases where individuals have exhibited powers well above their classified level, most notably in the case of Kaitabi Hatsuya and his use of gravitons over the last couple of episodes. Even though Uihara is laid up in bed with a fever, she still has some useful information to offer which might serve as a lead to those who know of this mysterious Level Upper possibility and how it all works.
Of course, Mikoto and Shirai head straight out the restaurant which supposedly acts as a meeting place for those in the know about Level Upper, with the former taking the lead in trying to extract the required information from them. This soon turns ugly however, forcing Mikoto to defend herself from a number of pretty unskilled thugs before coming across the boss of the gang, who turns out to be a rather more difficult prospect.
With no information gleaned from this gang it looks like we've reached a dead end, only to discover that all of the individuals who have exhibited abilities beyond their expected levels have fallen unconscious with no sign of coming around. Just what is going on? That's a question for the next episode...
As an introduction to getting to the heart of the Level Upper matter, this episode works pretty well without ever offering anything spectacular, although it was great to see some action between Mikoto and an opponent worthy of her abilities - There hasn't really been enough of that from To Aru Kagaku no Railgun thus far in honesty. Aside from those moments of action and the revelations towards the end of the instalment, this is really just a warm-up for what is to come - Let's hope it can live up to the long and gradual build-up which the series so far has worked towards.