Oh yeah, and since Golden Week collab event is running at the same time, I guess I might as well post about it.

Basically all you need to go is go here and fill out your Nutaku ID (notice: not your Kamihime ID, but your NUTAKU ID number!) and then the "password" which is a shockingly surprising "G O L D E N"

They may or may not check if you've actually played the games. My personal guess is that they won't and a script will just run for everyone who has done the Google form. But if you want to be safe, here are links to the games themselves:
1. G: Kamihime
2. O: TABA
3. L: Magicami
4. D: Versus Tales
5. E: Eiyu*Senki, honestly this just made me curious about the actual games.
6. N: ReBless Zwei, this is like Versus Tales done right, I guess? Once you get the hang of it actually seems decent, but it's so P2W that it's sickening.

Officially you just need to do the prolog (skip skip skip), and find the banner for Golden Week event. Usually under events. Those who have been playing KH for a while are probably already done with steps 2-4, so it's just a matter of logging in.