NG+ Full Guide

F10: load only the first Usami (and equip the Katana 5 at the bottom of the list - I forgot to do that before uploading the save)
Fog immediately upon entering the dungeon, run through, then Fog again upon entering Floor 7
When you reach Monokumasect, mash A (= just attack) and you win


F50: load Ryoma and Aoi
Fog spots: F1 immediately upon entering, F7 immediately upon entering, F12 entering the last area, F16 midway, F21 before the final straight section, F24 before entering the last little swirl, F25 near the puddle on the last straight, F31 immediately upon entering, F36 after the bottom section, F40 after beating Mon'Duba, F44 a few steps into the floor, F47 immediately upon entering
Fight strategy: Auto -> Conserve Focus on all bosses until Monokoppa. On Monokoppa, attack with Ryoma and Falcon Kick with Aoi. (It's possible that Auto -> All Out always selects Falcon Kick with Aoi but I've not tested it properly, it's faster if so)

NOTE: There is timesave by training an unit that can oneshot Mon'Duba as your primary attacker and only having the Falcon Kicker unit come in for Monokoppa. Ryoma can do this but his Luck makes him very likely to crit earlier bosses which produces slow crit animations. If I can be bothered I will grind out proper optimal units for this, it's only a couple seconds saved though.

F100: see here -> https://pastebin.com/xpQm68rN Fog spots have not been labbed out, nor has the category been labbed out very deep in general, but I doubt the setup can be improved much