CLAMP and Suga Shikao are once again together for a special comic in tomorrow's Young Magazine. CLAMP has a special xxxHOLiC chapter inspired by Suga Shikao's new single, あなたひとりだけ 幸せになることは 許されないのよ. The music video also captures scenes from the manga.
The single is available now on itunes jp. See his website for more information. Suga Shikao's new album, The Last, will be out January 20, 2016.
You can see a quick preview of the single's music video on youtube (via proxy if you are not in Japan).