I wish I was recording that fight...
Anyway, I just beat ***WINNER*** with a party of Rinnosuke, Yukari, Ran, Reimu, Youmu, Meiling, Komachi, Shikieiki, Nitori, Kaguya, Flandre and Marisa. I lost Rinnosuke, Shikieiki and Youmu first phase; Shikieiki was a bad switch into Dragons Flame, Youmu was either her or Reimu going to die and Rinnosuke is a sacrifice after firing off a WSMR.
I lost Marisa to a bad switch a bit later, as my only loss of the second phase.
He then opened up his third phase with his 30,000,000 HP heal, then healed another 8,000,000 immediately after. This meant I had about 66 million HP to plow through in his final phase-a daunting task. I thought I had lost, but obviously against this guy you don't give up. Yukari did fall to 130 HP at one point though, which scared me a lot to see.
Komachi got destroyed by a 450,000 damage attack a bit later, I thought 440,000 HP was enough to survive anything in the second slot but he has a move powerful enough.
Yukari got sniped, then Ran got sniped, but I kept on with my stall strats utilizing Meiling and her self-heal. Reimu got killed by a Light Arrow with bad damage luck but it wasn't an issue, I was past the point of needing area heals anyway (though she kept Meiling alive at one point)
That left me with Meiling for tanking, and Kaguya Flandre and Nitori in reserve. I took a risk switching Flan in before the Reimusnipe happened (literally right before, but Reimu was at full health so I thought nothing could kill her), and he used Wand of Dragons Flame which obviously Flan can tank.
My strategy for the rest of the fight was Meiling stall, switching in Nitori every chance I got and attacking. After a while,he just randomly died, without ever using Time Stop, with 1 HP Restoring Medicine left, and only 1 Lightspeed Movement used.
The best part is, I GOT HIS DROP TOO! That means I got every single Plus Disc drop first try except for the first one, which I got second fight.
Clear time is 87:52. a half a week of playing LoT, literally, got me to this point. Of course, there's 2 other savefiles with about 6 hours on them, the time I spent on game over runs (including a 40 minute ***WINNER*** attempt I streamed), the time I spent mapping...so I'll just call it 4 days.
That was a game well spent. Now back to taking detailed notes on the game for that segmented speedrun :V