蝶の毒 華の鎖～幻想夜話～

The fandisc of the game, "Chou no Doku Hana no Kusari" (released on May 2011). The fandisc adds onto what happened after the events of the happy endings as well as expanding on popular bad ends. There are lots of small bonuses, like a cult quiz, "Chou Doku Questions and Answers Notebook", and "Kyouko's Fortune Telling Hut". [Translated from the Getchu.com product page.]