Gensou Shoujo Taisen ("Fantasy Maiden Wars") is a Touhoudoujin game series in the spirit of the popular Super Robot Wars games, created by Sanbondo. The game is divided into four parts (two of which have been released so far), each of which covers the story of different Touhou games.The first part, Kou, has been translated into English by Deranged. The patch can be found here.
This series contains examples of:
The Cavalry: Mima appears to save Marisa in the Underground.
The Chessmaster: Kanako and Suwako appear only in cutscenes in Kou, seemingly planning their move for You.
Combining Mecha: After being defeated individually, the Prismriver Sisters huddle together to become a single unit, which is treated mechanically like an SRW Combining Mecha. This results in the Three Fairies of Light deciding to "combine" as well... in a scene which parodies Tengen Toppa Gurren Lagann.
Continuity Porn: The game blends the story of the official Touhou games, including the PC-98 continuity, into one.
Cultural Translation: The subtitles "Kou" and "You" come from "Koumakyou" and "Youyoumu", the Japanese parts of the first two Windows Touhou games' names (which are relatively obscure in the English fanbase). The Fan Translation renders them as "E" and "P", from their English portions, "Embodiment of Scarlet Devil" and "Perfect Cherry Blossom", which more closely fits the naming scheme of the Super Robot Wars games.
Leitmotif: Everyone has at least one. Sakuya, Nitori, Youmu, Aya and Sanae have different ones both as an enemy and as an ally. The three fairies gain one for their Combination Attack and another one in Combining Mecha form.
When Lily White joins your team she has only a single attack, low stats, and is practically an Emotionless Girl; she powers up (and brightens up) significantly once you get closer to where all the Spring was taken.
In contrast Easy and Normal compare themselves to more modern games, Alpha and Alpha Gaiden.
Readings Are Off the Scale: Any enemy unit whose current HP is exceeds 10,000 will have both their current and max HP values replaced with question marks. Their health bar still shows the percentage of their health, though.
Shout-Out: Tons, to Super Robot Wars itself as well as the countless mecha shows featured in the series, ranging from character dialogue, attack animations, to even musical nods.