[Touhou LostWord] vs B3 Hecatia DS - Lv120 clear!

Combat at 0:00. Character set-up at 2:21. Transcript & set-up info below in description.
Apologies for going really fast here. When I first tried to Lv120 clear this... like a year ago, my box wasn't as good for this. But now, the stage is very easy pickings... to the point that I thought it was a good idea to try bringing in a couple of my music / dance friends to battle for the fun of it. ^^
☆☆ Character Set-Up ☆☆
[L80 Youmu] --- [L80 Marisa]
[L80 Yuyuko] --- [L1 Merlin RE]
[C3 Yuyuko] --- [L1 Mai]
L80 Youmu - 5* MLB - Purple Heart, Rank 4 - Agi+100, Yang ATK+100
L80 Yuyuko - 1* LB0 - Purple Heart, Rank 4
C3 Yuyuko - 5* MLB - Purple Heart, Rank 5 - Agi+100, Yang ATK+100
L80 Marisa - 5* MLB - Purple Heart, Rank 5 - Agi+100, Yang ATK+100
L1 Merlin - 5* MLB Rebirthed - Green Heart, Rank 5
L1 Mai - 5* MLB - Pink Heart, Rank 4
Right now, Merlin has no FR2.0 enhancements in-game.
☆☆☆ Story Cards ☆☆☆
L80 Youmu: Yang Hard*, Yang Hard*, Yang Hard*, Yang Hard*, Break Time in Yomi
L80 Yuyuko: n/a, n/a
C3 Yuyuko: Yang Slice*, WoSD, Yang Slice*, Yang Slice*, BSG
L80 Marisa: Yang Slice*, Yang Slice*, Yang Slice*, Yang Slice*, NSL
L1 Merlin: n/a, n/a, n/a, n/a, LCSP
L1 Mai: n/a, n/a, n/a, n/a, Moriya Shrine Anni (or any 2 Crit DEF Down card)
Notes:
~ Yang Slice = Yang ATK + agility stat sticks
~ Yang Hard = Yang ATK + Yang Hard stat sticks
~ L80 Yuyuko does not need DST at all.
☆☆☆ Overview of Strat ☆☆☆
Gauge 1: L80 Yuyuko debuffs, L80 Youmu nukes
Gauge 2: L80 Yuyuko debuffs, C3 Yuyuko nukes (+ L80 Marisa sets up)
Gauge 3: Entire backrow debuffs, L80 Marisa nukes
Pick your favorite 2 debuffers (or other nuker+debuffer) for Gauge 3, really.
☆☆☆ Strat ☆☆☆
Warning: Restart if B3 Hecatia doesn't get poisoned by passive.
Turn 1:
L80 Youmu - Graze once, use skills 1-2-3, 2p LW
L80 Yuyuko - Use skill 1, 1p SC1
C3 Yuyuko - Use skill 1, 1p SC2 on Hecatia
Turn 2:
(Switch out L80 Youmu)
L80 Marisa - LW
L80 Yuyuko - Use skill 3, 3p Spread Shot
C3 Yuyuko - Use skills 2-3, 3p LW
Turn 3:
(Use L80 Yuyuko skill 2, switch out both Yuyukos)
L80 Marisa - Use skills 1-2-3, 3p LW
L1 Merlin - Graze twice, use skills 1-2-3, 1p LW on Clownpiece
L1 Mai - Graze twice, use skills 1-2-3, 1p LW on Clownpiece