Chp15 wasn't too exciting. Just a preparation to another chapter... Too little Mikoto, too much crazy scientist.
These two pages really reminded me of Elfen Lied's dicloniuses' vectors (with no blood)...
Also, another amusing thing is the appearance of characters from vol.15
Spoiler for just the picture:
and
<--just realized, but Ruiko is in the background outside the window...
I do find it (it=current events) amazing... when I remember that Mikoto is still in middle school. Σ(;゚Д゚)
A funny product I found on Amazon...
Click
Vol.2 of Railgun+Index Poker...
Wanted it... but it was sold out. ___(´;ω;`)