Toaru Kagaku no Railgun: Entenka no Satsuei Model mo Raku Ja Arimasen wa ne.

Misaka and the gang continue their fun at the swimsuit company's beach simulator. Uiharu rubs tanning oil on herself, and Misaka asks to join. Jealous of the attention Misaka is giving to Uiharu, Kuroko devises a plan... — written by CDB-Man Note: Bundled with the Toaru Kagaku no Railgun Official Visual Book. Listed as episode 13'. * Based on the Toaru Kagaku no Railgun manga written by Kamachi Kazuma and illustrated by Fuyukawa Motoi, which in itself is a spin-off of the light novel, manga and anime series Toaru Majutsu no Index.