A Certain Scientific Railgun S Season 2 Episode 21 English Dubbed Episode Title:Darkness.Episode Description:Heaven Canceller goes on to explain to Mikoto that Febri's body secretes a poison, requiring her to suck special lollipops to neutralize it, leaving her angry that another dark organization is performing twisted experiments. Whilst keeping this a secret from the others, Mikoto runs into Misaka 10032 who, having visited Febri the previous night, informs her that Febri had been wanting to meet her own big sister. She also reveals Febri gained her knowledge via Testament, leading Mikoto to believe Shinobu is involved. After receiving a call from Mitsuko about the importance of trusting friends, Mikoto realizes she should not have to do this alone and decides to inform Kuroko and the others about Febri's condition, becoming surprised and relieved to find they are more than willing to help. As Mikoto and her friends tries to find clues related to Febri, Yomikawa gives Mikoto a capsule found in the unmanned mech suit. Heaven Canceller examines the capsule which contains a strand of hair similar to Febri's, possibly belonging to her sister. However, he also reveals to Mikoto that Febri only has enough lollipops to stay alive for another 72 hours. With Mikoto deciding to face the darkness of Academy City once more in order to save Febri, Heaven Canceller arranges for her to meet someone familiar with the underground, that being Therestina Kihara Lifeline.