Hyakujitsu no Bara dj - Thorn Crown

Hyakujitsu no Bara side story, taking place after vol 2.

All 6 volumes of Thorn Crown are sketch copy-bon books that were expanded to become chapters 30-33 of the manga.

Thorn Crown I&II are also included in Taoyakana Kurueru Te ni, and Thorn Crown III&IV are in Galand of Wisteria (2018)

Thorn Crown - Luckenwalde was released in 2022, serving as volume 7 in the series. It's also included in Haitoumitsu to Chou