So, I took the time to seriously read up to Chapter 180 of I Created HGW and skimmed through the remaining chapters. Now I'm going to spoil it for you.
Raku Sou, after being isekai'd into the past via the Imaginary Number Space, becomes the Eternal King, slaughters all the gods, and then goes to sleep in Avalon.
Kaguya tries to construct a Kabbalistic Tree of Life that links 300 million worlds together. She wants to open a gateway to the Root to grant humanity some kind of transcendent power or concept that I honestly don't understand—you could say Kaguya is kind of like Amakusa Shirou, who once tried to grant Third Magic to all of humanity or something like that.
The Grand Servants try to stop her but all get killed. Kaguya cosplays as Pucchi, and pulls off a "Reverse Made in Heaven," rewinding the multiverse back into nothingness.
Raku Sou shows up in the most badass way possible with 13 NPs—THIRTEEN FUCKING NOBLE PHANTASMS. They fight across different worlds, destroy stars, and even fly straight into the "real world." In the end, Raku Sou wins, and Kaguya falls into the gate to the Root.
The ending of Celestial Curtain is Raku Sou returning to Fuyuki with Yukino, and the two of them give birth to 9 children.
Then in the real world, this arc becomes something like the previous "Destroy Japan" arc, focusing on countries like the US and those in Europe, where the heads of state act incredibly dumb and fucked up. I'm not exactly sure how to describe it, but I think you get what I mean.
Hagoromo Gitsune tries to summon a Great Old One. She turns 800,000 Tokyo citizens into Deep Ones. Tokyo gets destroyed again, of course. The other nations plan to nuke Japan, but the MC appears all badass once more, kills 6 Outer Gods on his own, resurrects hundreds of millions of people with a snap of his fingers, and then disappears for another few dozen chapters.
The ancient gods get revived, and suddenly the Garden of Eden from the Bible appears. Everyone and all the nations try to get inside to find the immortal golden apple. It turns into a typical "heritage exploration" plotline you'd see in xianxia novels—like, wtf.
Then, worlds like Naruto, Re:Zero, Konosuba, etc., get connected to the real world. They view the real world as heaven. Characters like Jiraiya, Orochimaru, etc., appear, each getting a few paragraphs to express shock and awe at "heaven," then disappear again with no clue if or when they'll ever come back.
That's as far as I read, but it was more than enough to make me feel disheartened. The thing I looked forward to the most—an HGW in the real world—never happened. Yep, not a single HGW at all.
Thank you for supporting me and sorry I couldn't finish the story.
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If you have any good raws, please leave me the Chinese name, I will take the time to read and choose to translate in the future.
And thank you DragonPT0LB4, Grailphoneix16 and Death0601 for the raws you suggested.
bye bye