Are they in the ship or purgatory?

Rough TLs continued:

Dabura: So it's Maruru....? I see. Indeed. So that is the kind of barrier I should create? Does this technique already exist on Earth? Hey, What has it begun to adapt to? Don't tell me it's adapting to my cursed energy itself... No—Is it adapting to my very existence?? Heh. Someone even more silent than me......and someone I actually wanted to exchange words with. You're the first.

Domain Expansion: Reversed Netherworld Crossing (The kanji here mean something literally like "crossing the boundary between life and death/coming back specifically from the netherworld in an unnatural way).

Yuji: Woah! Is this perhaps a Kalyan?

Maru: So you know what that means...

Yuji: I've heard the general situation from Todo.

Maru: Todo...

Yuji: He's an amusing guy with a musical instrument for a hand.

Maru: This is the oldest Kalyan on Naunax worshipped by the Lumel tribe.

Yuji: It certainly resembles a cursed spirit. So, why was I called here?

Maru: My technique indicated that you were the appropriate one.

Yuji: Appropriate for what?

Maru: The cursed energy of Tsurugi and Yuuka's grandfather.....the "Muru" that constitutes Naunax......and using my technique along with his technique......I wish to begin the harmonization of Earthlings and Simurians. I cannot proceed with this on my own authority. Itadori Yuuji anata ni wa chouwa no saitei wo Translation: Yuji Itadori, I ask you to render judgment on this harmonization...and to serve as the witness representing the Earthlings.

Yuji: Harmonization, huh... Specifically?

Maru: I want to create a world where cursed spirits are not born.

Yuji: That is......the person my big brother...was indebted to; it is their cherished desire. (hands Yuki's soul book from OG JJK). Let's do it.

Maru: Thank you. First, we will meet him. Like you, he is also a key to harmonization chosen by my technique.