Underwater Municipal Tower - Soul Hackers 2 Part 21 - No Commentary

Difficulty set to normal
This video covers the first half of the final dungeon, 24th Ward Municipal Tower. Here are the timestamps and notes.
Note: You are free to come and go from the final dungeon at any time. The point of no return is right before the final boss. If you just want to progress and not get lost: Ask the southern Unctuous Demon on 2F to change the flow up (14:24), follow the path till you reach the stray Unctuous Demon (19:04), agree to go with them, then ask them to change the flow downward.
0:00 Arriving at the 24th Ward Municipal Tower
3:31 Exploration begins
4:47 A pair of Phantom Society summoners stops the group
5:35 Boss fight
8:42 Arriving at 2F
10:40 The western Unctuous Demon explains how they change the flow of water.
14:24 The southern Unctuous Demon changes the water flow upward
15:46 The western part of 2F
16:27 Ringo spots a vortex without a Unctuous Demon
18:12 An Unctuous Demon changes water flow by it upward to 3f
19:04 Finding the stray Unctuous Demon, they bring you back to the vortex. Up leads to the quest item Research Notebook
23:11 Back on 2F, returning to the stray Unctuous Demon and changing the flow down
24:36 Finding the Grand Executor
27:38 Boss fight