Just select Torrents at top left of Akiba screen. A search on the word lesbian will not display them since they usually do not have the word lesbian in the description. That is why you have to go through the torrents pages 1 by 1. For some reason since Akiba was down I am only able to get 20 pages of torrents. I found in the past lots of lesbian torrents, often posted before they showed up as downloads with Ryushare links.