Well its easy to guess those 4 stories...
As for the Magic Side we have:
1- Touma + Index plot.
2- Kanzaki
As for the Science Side we have:
3- Mikoto
4- Kuroko
Wait...where is mah wan-way-rodo????
I hope I'm wrong and its just Mikoto + Kuroko and the 4th story is Accelerator's ;____;