All the Important Things I Learned in a Bathhouse

As Misaka and the gang decide what to do for the day, they encounter Konori-senpai handing out pamphlets for her childhood public bathhouse; it is struggling with slow business and facing closure. Wanting to help out, the gang comes up with a unique idea to save the bathhouse...

— written by CDB-Man

Note: Bundled with the Toaru Kagaku no Railgun S official visual book.