Tips

AoE Yellow students work best here. Yuzu performs best here due to urban terrain affinity, but others like Nonomi and S.Yukari still work as well.
Using ST Yellows also works, but the clears are generally slower.
Front center bot has 1.08M/3.6M HP, front side bots have 661.5K/2.2M HP, and back bots have 303K/909K HP.
All enemies have (Stage # x 500) DEF, resulting in a ~50% damage reduction. DEF Down is useful here, at least for the front center bot.

• Stage 3
  • Healing Avant Guard deals 2x damage to all enemies.
  • You can use this gimmick for an easy clear.
• Stage 4
  • Your students receive 1 stack of 25% Piercing Effectiveness for every 20% hp Avant Guard has, up to 4 stacks. This means that keeping it above 80% hp will make you hit 1.5x harder than usual (200% base effectiveness + (4x 25% piercing) ).