The Versailles 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 Versailles no Bara, and 1984-1985 (second publication). (Source: Wikipedia)

Versailles no Bara Gaiden was published in English as The Rose of Versailles Side Stories: The Great Detective Loulou by Udon Entertainment as the 5th volume of The Rose of Versailles on May 4, 2021.