Lunar Wing: Toki wo Koeta Seisen

The player (Le Zion) is a commander of a flying vessel and you have to spend all the time traveling from one place to another in the land of Sera, talking with girls and convincing them to join your party. From time to time each one of them will close you in a room and try to corrupt your innocence.You also have to save the world in epic battles against the evil in your (few)free time