Diamond is Unbreakable (CD)

The Diamond is Unbreakable Drama CD Collection (ダイヤモンドは砕けない ドラマCD) is a set of two original stories adapted from Diamond is Unbreakable that was released by David Production from 2016 to 2017 enclosed within the 6th and 13th volumes of the limited edition Blu-Ray. One has Josuke, Okuyasu and Koichi investigating a ghost story, and the other one is Josuke and Koichi trying to help Okuyasu regarding a waitress he fell in love with.