The team's placement starts at the bottom middle, and there's a gap between the left and the right, so you will have to split the team to 2. The left side has 3 Samurai bandits and a マインドフレイア. The right side 3 Rangers, 2 Energist, and a マインドフレイア. All bandits are dark element and have -10% light and slash resistance.
While it may seem tempting to bring a team of Light and Slash units, unless you have enough damage to one shot some of the enemies, it will be quite a struggle to survive multiple attacks because you'll take increased damage as well. Most of the enemies tend to group up together, so using units that's good at dealing area damage can really help.
This mission can be fairly done in auto, as long as your bruiser/tank that is going to the left can survive long enough until the right side is over. The area gap between the two sides aren't that far, so healers like Ildyra can still reach both sides for support. Units going to the left will need some slash resistances, while the units going to the right will want missile and magic resist.