Also known as: ハルカVSエスカレイヤー
A side story for Choukou Sennin Haruka released in 2009 as part of the Alice 2010 compilation. As the title implies, it features an In-Franchise Crossover with Choukou Tenshi Escalayer.
It notably introduces Escalayer Reverse as a separate character from her "good" counterpart.