Eientei vs 13F Eiki (Labyrinth of Touhou 2 Steam)
Here's a fight where Satori can't upstage Kaguya at the last second
Despite how simple the strategy is (hit Eiki with Kaguya's NTR element, piercing spells), this fight was pretty messy. The beginning of the fight is just full of RNG, as there is no way you'll be able to protect everyone in front from every ailment. While you can give Komachi First Aid and 3x Star of Elendils / Star of the Just to make Komachi the perfect tank, it's still possible for Eiki to ignore her and use Spirit Decomposition on Slots 2 or 3 instead.
Things get easier once you've landed your first Cowrie Shell on Eiki, since (with the same class and skill setup) it's enough to move Eiki onto her first use of Concentrate to Final Judgment. Since Kaguya can easily pierce Eiki's defenses, it's easy to force Eiki into a loop of using Concentrate to Final Judgment, giving you ample time to finish her off. At that point, it's just a matter of juggling a few tasks (i.e. debuffing Eiki, buffing Kaguya, boosting Kaguya every 3rd turn with Herb of Awakening, and also using swap shenanigans to build up her MP). Oh and don't forget to use Hourai Elixir on Komachi too.
Music is "Flight in the Bamboo Cutter" by Dark Phoenix
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