The Black Knights and the White Princess Knights

The Black Knights and The White Princess Knights (漆黒の騎士と白の姫騎士) was a story event in Assault Lily: Last Bullet, starring Aizawa Kazuha, Kon Kanaho and Sasaki Ran, with the members of Legions Hervör and Gran Eple in supporting roles. It ran from May 15, 2021 to May 3, 2021.

Translation
The complete English translation of The Black Knights and The White Princess Knights can be found here in Google Doc format.