Thread:Vaculity/@comment-27131300-20151103023526/@comment-27131300-20151103055831

I was theorizing the Twin Blades where released in 2009, since almost all japanese videos and media before 2009 featuring accessories didn't had info or showed the Twin Blades.

This page only has been updated once on January 2010:

https://web.archive.org/web/20100101000000*/http://umiga2.web.fc2.com/data/acce_price.html

This update (1.109) in January 7, informed about a bug fix involving the Twin Blades further confirming that it was probably released in late 2009 ( 双神刀「月歌・謳華」)

http://www.getamped2.jp/gamania/info/topic/15791