La forteresse cachée

A mysterious girl named Salat suddenly appears before Heero and his friends. Palpa and Girou urge Heero not to get involved with Salat because of her mysterious and mysterious identity. However, Heero feels that Salat is alone and in trouble, so he asks her to join him... Meanwhile, Heero is held captive by a feudal lord in the town of Iinsekise, who is demanding his forced labor. Will Heero be able to escape...?!