I'm not going to make a proper post for this Tower. This post from whopping 17 months ago has basically what you need. Scroll down and you'll find videos of the clears, as well as the plan for 17F-20F. Notice that the "higher floors" are now easier, whatever that means. I assume 16F+ has less HP and/or do less damage, I don't know. There will be no bonus Medals for clearing fast, so you can just make steady and strong teams instead of risky high-hitters anyway.

But what you need to remember is that you need to run FOUR HIME TO THE FIRST SIX FLOORS. We've been using two Hime for years, so people are going to fuck that up. Again, BRING A FUCKING FULL TEAM TO THE FIRST FEW FLOORS.