"I Want To Be Onee-sama's Power" (お姉さまの力になりたいですの Onē-sama no Chikara ni Naritai desu no?) is the 7th episode of the Toaru Kagaku no Railgun S anime series, and the 31st episode of the anime series adaptation of the Toaru Kagaku no Railgun manga series. It was first broadcast on May 17, 2013. The script was written by Yamada Yasunori, storyboarded by Takayanagai Shigehito, and directed by Hatano Kouhei. The animation was directed by Ushijima Yuiji and Matsumoto Fumio.