There is a fan theory that Black Lotus is the Daughter of Kirito & Asuna from Sword Art Online, another series by Reki Kawahara that takes place in the same world as Accel World. This theory is built mostly on the fact that Black Lotus' design looks like a combination between the 2 characters.
Accel World adapts the first 4 novels of Reki Kawahara's light novel series of the same title, as well as content from the 10th novel.
The first two episodes received a pre-airing held in collaboration with various stores and webstreaming services. The first one took place at Gamers's Akihabara head office in Tokyo on Friday, March 23, 2012. Others took place at Softmap Akihabara also on March 23, 2012, Animate Nipponbashi in Osaka on March 24, 2012 and Comic Toranoana in Nagoya on March 25, 2012. Attendance was limited to 400 people, 100 for each location, and participants were chosen through a post-card lottery held until Wednesday, March 7, 2012. Additional webcasts were streamed at Bandai Channel on March 26, 2012, at PlayStation Store between Wednesday, March 28 and Tuesday, April 3, 2012, at Warner on Demand between April 1 and April 2, 2012 and at Nico Nico Douga on April 2, 2012. Viewership was limited to 1000 accounts for all services except Nico Nico Douga, which was limited to 2000. The regular TV broadcast started on April 7, 2012.