User blog comment:KodachiZero/Hatsune Miku Collaboration (Translated)/@comment-65.102.143.22-20141008203722/@comment-25251916-20141008205226

Please read the comments below. There is some information regarding the code for Luka. To note as well, the game will not be released until the set date on the website, 10/28. This is when most likely the codes will be released.

Wait for further announcements and make sure you get the email saying your pre-regristration is complete (japanese kanji).