Hi! For the first quest, I think having just a healer should be enough. But if it's not, here’s my quick guide for combat
Ami (the healer) has a skill called Cheer, which makes all attacks deal 2x damage on the next turn. Use it on the teammate with the highest damage output (STR x 2 for melee dmg and Int x 2 for magic dmg).
If normal attacks not enough, here’s a list of useful skills:
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Sweep Attack – Practice with Yoru on the weekend twice and you’ll unlock it. This is the highest damage skill for your character. Use Cheer and then Sweep. at late game this can burst around 5,000 damage per turn.
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Give a Skill Book to Rin – She’ll get an AoE (area of effect) attack. Combine that with Cheer and you can finish the fight in 2–4 turns.
Later in the game, you might notice Ami can get one-shot. You’ll want to learn the Iron Wall skill, which makes enemies target only you, so she can stay safe.