First single by legendary band Deshabillz during their limited revival. All songs were written by KISAKI, and lyrics written by SHUN.

The original title was slightly different: Aa・・・ Fuuju no Tan ~Jitsu no Naru Ki wa Hana kara Shireru to Oshieyou・・・ Yogoreta Minasan Ohisashiburi desu, Kegareta Minasama Hajimemashite・・・~ (ああ・・・ 風樹の歎 ~実の生る木は花から知れると教えよう・・・ 汚れた皆さんお久し振りです、汚れた皆様はじめまして・・・~).