It is just a poor stand - in for an actual story mode. (oracleoffilm.com)
If this occours during the actual story mode, as opposed to a Monster Map, the current chapter will become unbeatable, requiring you to restart the chapter. (gamerankings.com)
Hopefully Koei takes a little time to work on the actual story mode, expand upon it, and give us an even larger cast of characters! (animegamesonline.com)