Toaru Majutsu no Index Light Novel Volume 19/Chapter 1

Synopsis
Quetzal (disguising himself as Unabara Mitsuki) had a senpai-kouhai relationship with the Aztec magician after his life in vol 15, Xochitl, and now after that incident she calls him ‘onii-chan’ again after a long time. Motoharu comments that he’s a lucky bastard having a ‘imouto’-type girl, and even better one that’s not blood related. Motoharu also mentions how in the world Unabara can try and pick up a girl from Tokiwadai (Misaka Mikoto) when he already has this girl, and Xochitl starts giving unabara death-glares. Xochitl starts questioning Quetzal, saying he better not have betrayed their organization for something like this. Awaki comments that Motoharu and Quetzal’s wasting time on little girls when they have a job to do (Motoharu was with his maid-sister before meeting up with rest of GROUP) and suggests Accelerator stop them, but Accelerator says he has no right to stop this kind of thing (LasT Order and all…). Awaki then says she’s surrounded by perverts, but the rest of GROUP replied with the same timing she’s the same since she’s a shota-con (no proof yet though, but she didn’t deny the claim).

GROUP gets hired to take a rogue ‘group’ called ‘Spark Signal’ in academy city, though after Accelerator wiping out their main force they found they’re after info on DRAGON, and should’ve squeezed info out of them first.