After the scenes, you’ll be fighting in the desert and you have to reach the Wind Tribe’s chief, Fuga. In the lower left of the map, you can find Hinoka, Azama, and Setsuna. There are also two dragon vein points here that can turn the desert to plains since the former terrain reduces movement by 10 points. Your sky knights will be unaffected by this terrain disadvantage.
During Hinoka’s party’s turn, they’ll move towards your group so have your main character talk to Hinoka in order to recruit the three of them. Move your way north after regrouping with Hinoka then activate both dragon veins. There shouldn’t be that much trouble wiping the enemy forces off in this mission, given your superior numbers and units.
After the battle and a short post-battle dialogue, you’ll have Hayato, a young Wind Tribe added to your team.