 Dolly released their next single named "Moonlight disco" (ムーンライトディスコ) and a best-of compilation "「PRIVATE SHELL-Complete The Best 2005-2011-」" in November.They continued at a steady pace despite drummer Tsuguki's short absence due to illness, and released their next single "Koushoku no Canary" (虹色のカナリア) in April 2012.Sadly, three days after the release of the single, on April 27, 2012.