The Berusaiyu no Bara Gaiden series is a collections of short stories written by Riyoko Ikeda. These stories were published in two separate magazines in 1974 (first publication) after the serialization of the manga Berusaiyu no Bara, and 1984-1985 (second publication).

The Gaiden stories were adapted into musicals in 2008-2009.

(Source: Wikipedia)