A Certain Magical Index: Novel Vol.9
Academy city's largest school event, the Daihaseisai.
The event is an athletic festival that also doubles as a large-scale experiment for ability development institutions which aims to determine the effects of interactions between abilities.
Of course, Kamijou Touma is a participant. However, his "misfortune" is going strong, having his head gnawed on by a hungry Index, facing a lecture from Daihaseisai Committee member Fukiyose Seiri, and fighting against Misaka Mikoto in an ability contest.
In the middle of these events, a mysterious object, the "Stab Sword", is carried by a certain magician that infiltrates Academy City.
Oriana Thomson. a leading "courier" in the Magic side, also known as "Route Disturb", and her motives are...!
When science and magic collide, Kamijou Touma's story shall begin!