I just saw this announcement today, so I'm adding it here.
Annabel - fall into a lilac slumber
Annabel is releasing a new single. The composer is Sentimental Vector's Taguchi Shuuichi.
And while I'm at it...
Sentimental Vector + siraph - ストーリーテラー (Storyteller)
A new single and a collaboration between Sentimental Vector and siraph.