My usual strategy is to use characters with high SPD and high ATK/RNG like Marisa or Aya to reduce the next attacker's HP to minimize the damage to my team. I also tend to reduce the enemy units' HP evenly, prioritizing on the most powerful enemies first. After that, I could relentlessly decimate them~
Remember, offense is the best defense. =)
And initiative strikes are the most crucial part of winning the battle (insert Kenichi reference here)
on a side note (could be i asked this before): seeing this makes me wonder: how old are Marisa and Rinnosuke
This PV makes me a bit curious. But it's more like....inspiring?