Now that you mention it, when it crashed the first time, I loaded back to my in-game save. It still crashed (specifically, it freezes), updated the game and followed up with the same strategy I had used before. So my positioning was roughly the same, not exactly, but I'll still try repositioning my units and see if anything changes. Thanks.
No, what i meant is: start the whole stage over. The WP condition changed from the early patches, and that might be the cause of the crash.
Everyone, lend me your strength. With our hands, we will stop the sun!
Everyone survived, only 1 bomb was used.
Final Results:
Fun fact: About 150 of those turns are used in full rout in Reimu vs. Marisa.
Builds specific for the Final Stage:For good reasons, the final patch toned down Okuu's Armor value cause Reactor of Life + Super Armor makes her pretty much untouchable. By bombing the Super Armor off, it makes it so she can actually take damage.
1) Yuugi @ Oni Horn + Grimoire
Nitori FA @ Oni Fang + Sakuya's Tea + Yakogoro Medicinehttp://puu.sh/eJZFX/811faf4101.jpghttp://puu.sh/eDjDl/9b8af81787.jpg(It should be noted that Yuugi changed alot in the later patches to be less broken. Rowdiness changed to Fury only. Isuki-Tousen became better since now it works within 3 spaces.)
Yuugi's Ability: Oni Strength, Guard L2, Power Limit Over, P-Break, E-Save, SP Up L4, Unique: Isuki-Tousen
tl;dr: Isuki-Tousen + Guard L2 + Oni Strength = -40% on damage taken
For some reason, casting Fury turns off Isuki-Tousen's damage increase. It does not matter anyway. To see her defensive power, @1900 base Armor, she tanks Subterraean Sun under 500 power with only 3500 damage without casting Iron wall, Adding Nitori's amazing support in Extending Arm, it grants Yuugi more SP, and refuels the giant MP bar. If there is someone to bring in on Lunatic, she is a great choice.
2) Flandre @ Parasol
Meiling @ Crimson Crystalhttp://puu.sh/eDjGv/79e68f7878.jpgFlandre's Ability: Belief, Power Limit Over, P-Break, Support Attack L1, E-Save, SP Up L5, Unique: Fire Rod
Meling's Ability: Guard L2, E-Save, Support Defense L2, Unique: Dragon of the Scarlet Devil
Her role is to stand in front of Okuu, next to Yuugi, and deliver massive damage from only 1 cast of Strike. Dragon of the Scarlet Devil allows Meiling to come in with Support Defense on my own turn, but only up to 3 times a stage, so in early part of the boss fight, I use Meiling to slap around the boss for a bit, or let Flan eat the attack on the first phase.
3) Prismriver Sisters @ Hourai Branch + Mini Nuclear Reactor + Oni Hornhttp://puu.sh/eDjQR/27455c271e.jpghttp://puu.sh/eDk15/dc3c29acce.jpgLunasa's Ability: Musician, Power Limit Over, E-Save, P-Break, Belief L1, SP Up L4, Unique: Ensemble Leader
The other two poured everything into SP Up, and the leftovers the went the Shooting and Accuracy stat respectively, cause this unit works exactly like Aquarion units in SRW.
With Mini Nuclear Reactor, Lunasa and pretty Daunt MAP each turn for free. This is important as no one can get into position otherwise, Okuu's power need to dip below 150 in order for that to happen. She also does not use the inital MAP anymore once you get into her Spell phases. Lyrica also carries her free support skill, and is position next to Yuugi when they split, so she can cast Alert and have Yuugi fire off a support, and then Flandre finishes the support chain.
Other things that are good and important:
1) Suwako + Kanako
Suwako carries Armor Break, and Kanako carried Power Limit Over. Kanako got really good Sheishin to boot.
2) Yukari + Ran
Ran carried White Fox as her Unique, this allows her to Split Image with about 42% rate. It also helps her accuracy stacking with Shikigami (Yukari)
Yukari carried Borders of Dreams and Reality, stacking with Memories of Wicked, her Sheishin that are cast by Dream is almost the same as the base cost this way. With over 170 SP in her disposal, she is stands in front of Okuu and spams Quadruple Barrier.