Ep. 21: Misaka seeks the creator of synthetic Febri to repair her after investigation stalls.
Aired on September 6, 2013Filler

Following the discovery that Febri is a synthetic being, Misaka resolves to locate her creator and demand repairs. The search for answers encounters significant obstacles across multiple fronts, effectively halting progress. Despite the assistance of her friends in pursuing various leads, the investigation remains stuck. Eventually, assistance arrives from an unexpected source, offering a potential breakthrough in the effort to restore Febri. This development shifts the dynamic of the search, introducing new variables to the ongoing quest for the individual responsible for Febri's construction and current state.
Episodes
- Ep. 17 · Girls plan a study session and potluck stew party at Saten's apartment before summer ends.
- Ep. 18 · Edasaki prepares for discharge and moves in with Haruue while a new city movement begins.
- Ep. 19 · Febri bonds with Saten while Misaka feels slighted by her cold demeanor.
- Ep. 20 · Yomikawa Investigates Robots While Konori Takes Gang to Bathhouse
- Ep. 21 · Misaka seeks the creator of synthetic Febri to repair her after investigation stalls.
- Ep. 22 · Therestina gives Misaka clues to find Febrie's secret group behind STUDY Corporation
- Ep. 23 · Aritomi explains STUDY's project to Misaka, who learns of Nunotaba's plight and the Reach Assembly plans.
- Ep. 24 · Shirai, Konori, Kongou, Uiharu, Saten, Misaka, Febrie, and Aritomi face powered suits and final surprises.