According to their official facebook account, mangaka Yamada Yoshihiro
and the editors of Morning Magazine are no longer responsible for the TV anime Hyouge Mono
. The author's credit changed from "原作" (the original work) to "原案" (the original scheme). Yamada Yoshihiro and the editors refuse to give an explanation for the incident.
's song 'Ebi Sukui' has been used for the OP since the arrest of Kosuga Tsuyoshi.
Source: Hyougemono Facebook
Related topic: Theme Song Musician of Hyouge Mono Arrested for Possessing Marijuana