For all the people following them on Ameba, they will no longer be using Ameba as their official blog. Now, you must go to the blog on their official site
摩天楼オペラ | 公式blog. Also, if you haven't been to their official site,
摩天楼オペラ公式サイト, the thing at the top is the new address for fan mail(for presents and all that).
Please check the member's profiles for their new email address for fan mail(basically, put the member's name followed by @matenrou-opera.jp). Finally, link to their page on King Record's site
Kingrecords Webcommunication