Board Thread:Questions and Answers/@comment-5149755-20150529050330/@comment-122.47.186.14-20171223115914

123.211.129.20 wrote: Does anyone else know anything about these? Or were they just put in the anime version to make it more pretty? I bought an animation guide book of SAO while I was in Japan. On the third page it shows the "protrusions" in a guidebook original picture, but I can't read Japanese.

The Perfect Guide: Animation Sword Art Online

is what it's called.