Toaru Jihanki no Fanfare

Toaru Jihanki no Fanfare summary:

Toaru Jihanki no Fanfare is a Toaru Kagaku no Railgun mini-novel by the author of the Baccano! and Durarara!! series, Narita Ryohgo. It was included with the special edition of the Toaru Kagaku no Railgun Manga Volume 05 as part of the Pseudepigrapha Railgun artbook.
Misaka Mikoto finds herself fighting against the Rank 7 Level 5 of Academy City, Sogiita Gunha. However, a young girl turns out to be the culprit behind their unprepared display of abilities: a primary school student named Kihara Nayuta.