Haworthia (ハオルシア,Haorushia) is an audio drama written by Ryukishi07 and published by M.Graveyard and Pomexgranate. on October 29th, 2017. Haworthia has been said by Ryukishi07 to be a prototype for Ciconia no Naku Koro ni.[1]
↑Famitsu Special Interview 10/24/2019. Ryukishi: 2 years ago in November dai-san and others created Haworthia Drama CD, which was a test-case for Ciconia’s concepts.