Rain Dancers was originally a Muv-Luv Alternative fanfiction written by Wei Luxin.
It was officially recognized by Age and published by them during the âge x Nitro+ Kanzen Gattai DX Godo Akiba Event, the 27 December 2008, as part of a fanbook called MUV-LUV ALTERNATIVE LD2 PROJECT PROMINENCE.
Later, Chicken Divers was made into a visual novel which was released at Comiket 77, which took place during December 2009 (29-31). Unfortunately, this release was full of bugs.
The 30 July 2010, it was republished inside Chronicles 01, bundled with the databook MUV-LUV ALTERNATIVE LD3 Code：Rebellion. Voices were added and the production value enhanced.

Rain Dancers is a short story that takes place in November 1995. It details part of the effort of a combined European force using the brand new test EF-2000 Typhoons to create a foothold in Europe by retaking parts of Italy from BETA control.

[Synopsis from the Muv-Luv Fandom Wiki]