User blog comment:KodachiZero/Weekly News - 2/@comment-28412955-20160616093213/@comment-28010705-20160622152645

I did it before the 21 (the registration link was active) and received a mail entitled "【事前登録完了】『チェインクロニクル』×『ダンジョンに出会いを求めるのは間違っているだろうか』コラボキャンペーン" from "noreply@pre.sega-net.jp"

It seems to be the confirmation, right? But I only received 2 mails about how to install the game, etc...

This sentence seems to be linked to the reward: "6月21日イベント開始当日に特典の「SRリリルカ」のプレゼントが貰えるURLをメールでお届けします. " but no more news about it... :'(