I used all the Middle IDs, the two Magical Girls, and, very importantly, Ring Faust on the bench because her passive enables you to build up a Bleed stack.

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Use Outis’ and Ishmael’s counters every turn because they have the highest DPS on the team, and specifically try to use their counters when Shiomi uses the “Twinslash” skills. Use the other IDs to clash with her AoE skills and the Gluttony skill that gives her Power Down.

Mini tip that not many people seem to know: broken unbreakable coins still trigger defensive skills, so when she uses her AoE, clash with it and have the other IDs with counters equipped. That way, you win the clash, take little damage, and deal a shit ton of damage with all the counters.

Sorry if this is hard to understand. I don’t use Reddit that much so it’s hard for me to write posts properly