[Touhou LostWord] vs B5 Merlin DS - Lv120 clear! (Purple Heart Only)

Combat at 0:00. Character set-up at 3:23.
This took a bit less time than the A6 Lyrica battle... so it didn't feel too bad. That's also why I took more time playing since I was still getting a feel for how I should be doing the clear strat.
At least I got to show off the strength of my Reimu alt in this stage. ...What do you mean it was supposed to show off L10.1 Reimu's strengths, not L80 Reimu's?
☆☆ Character Set-Up ☆☆
[F1 Koishi] 》-----《 [L80 Kaguya]
[L80 Yuyuko] 》-----《 [L80 Kasen]
[L80 Reimu] 》-----《 [F1 Reimu]
F1 Koishi - 5* MLB - Purple Heart, Rank 4 - Yang ATK +100, Yang DEF +100
L80 Yuyuko - 1* LB0 - Purple Heart, Rank 4
L80 Reimu - 5* MLB - Purple Heart, Rank 4 - Agi +100, Yang ATK +100
L80 Kaguya - 5* MLB - Purple Heart, Rank 4 - Yin ATK +100, Yin DEF +100
L80 Kasen - 1* LB0 - Purple Heart, Rank 4
F1 Reimu - 5* MLB - Purple Heart, Rank 5 - Yin ATK +100, Yin DEF +100
☆☆☆ Story Cards ☆☆☆
F1 Koishi - Yang Hard*, Yang Hard*, Yang Hard*, Yang Hard*, LSaS
L80 Yuyuko - Party SP card (!!), n/a
L80 Reimu - WoSD, Yang Slice*, Yang Slice*, Yang Slice*, Karma Speed
L80 Kaguya - WiH, Yin Hard*, Yin Hard*, Yin Hard*, Kaguya's Moonlit Festival
L80 Kasen - n/a, n/a
F1 Reimu - Yin Slice*, Yin Slice*, Yin Slice*, Yin Slice*, Reisen's Moonlit Festival
Notes:
~ Yang Slice = Yang ATK + Agility stat stick
~ Yang Hard = Yang ATK + Yang DEF stat stick
~ Yin Slice = Yin ATK + Agility stat stick
~ Yin Hard = Yin ATK + Yin DEF stat stick
~ (!!) It's just advised to use a Party SP card on Yuyuko to get Reimu to 5p on Turn 2. It does NOT have to be Scarlet Tower Anni. It might be possible w/o party SP card anyway.
~ If you have a -3/-4 AoE Yin DEF card on Reimu LW, use that instead.
☆☆☆ Overview of Strat ☆☆☆
T1: L80 Yuyuko debuffs, F1 Koishi nukes
T2: Yuyuko debuffs, Kasen buffs L80 Kaguya & L80 Reimu, L80 Reimu nukes
T3: F1 Reimu debuffs, L80 Kaguya nukes
☆☆☆ Strat ☆☆☆
Turn 1:
F1 Koishi - Use skills 1-2-3, 2p LW
L80 Yuyuko - Use skills 3, 1p SC1
L80 Reimu - Use skills 1-3, 1p SC1 on Lyrica
Turn 2:
(L80 Yuyuko uses skills 1-2, switch out L80 Yuyuko)
(Switch out F1 Koishi)
L80 Kaguya - Use skill 2, SC1
L80 Kasen - Use skills 2-3, 1p SC2
L80 Reimu - Use skills 1-2, 3p LW
Turn 3:
(Switch out L80 Reimu)
L80 Kaguya - Use skills 1-3, 3p LW
L80 Kasen - Graze twice, use skill 1, 2p Spread Shot
F1 Reimu - Use skills 1-2-3, 2p LW

[@oscheoroset1298]

Thanks for the guide. Both of your Prismrivers clear help me tremendously. Also, you probably can clear both of them with the exact same team, I only replace A6 Sunny with L80 non-MLB Kasen and I still be able to clear this, so I really don't think Kasen matter that much, but probably with more RNG since accuracy debuff lol.