The stage for this tale takes place in a small and remote village called "Cane village".

The paths leading to the village suddenly change into a deep forest, in addition many fierce monsters make this forest their abode which threatens the peace of the village.

The innkeeper of the village Luis writes a letter to his older sister Tanya, an adventurer by trade, requesting her assistance to investigate the cause of the sudden changes.

After receiving the letter, Tanya brings her disciple Lille along and heads towards the village where Luis is waiting...

[Own translation based on official story blurb from http://lunasoft.jp/product/lus007/about.html]