Sengoku Gensokyo (InstanceTopic, 18)

From Compile Worlds

Sengoku Gensokyo is a parody of Sengoku Rance starring Touhou characters and locations. It's made with the KiriKiri engine, though at first glance it may seem to run an updated version of the software used to create the Rance games.

Unfortunately its interface is a bit unintuitive, but the much more balanced battle system, hilarious (and at other times, very moving) cutscenes and epic music more than make up for that!