(Aufheben is finally defeated! And from what I see down there... is that the 2nd dimension? Is that the merging of this dimension and Zipangu??)

This... this will allow me to finally meet Ashray.

(I hear a voice from somewhere. This... this is...!! I keep looking around, wondering if anyone is going to pop out, but all I see is my comrades.)

Ah......Ashray, so she's... there.

(Wait a minute, this voice of sadness...is this really... Dunas!? But where??)

(If Dunas was involved in this, then the one that helped summon Aufheben may have been Dunas as well. Regardless, there's no way to spot Dunas)

(The view of the 2nd dimension begins to fade away. The merging of Zipangu and the dimension probably stopped the moment I defeated Aufheben)

(The building started to shake violently. This building may not last much longer. I told my comrades to escape immediately. If I emerge from that exit, then we'll be able to exit and return to Kamuna)

Marr! Marr! Where are you? Where are you???

(Wait... so that's Dida's voice!? So he had been in search of Marr!? If so, then why is he looking for Marr here right now? Anyway, not only that, but the building is already on the verge of collapse. Staying here may cause much more problems than leaving. Do I have to return to Asia...?)

(For a moment, I imagine staying put in this building. Then I begin to wonder if that's really a good thing. While this was going on in my head, the building is collapsing at a faster rate.)

......! Hello! Are you okay? I can't believe you're really alive after this!
(When I woke up, Asia was next to me with a look of concern. Was I knocked out all this time...?)

Thank goodness you collapsed AFTER reaching here. I see that with the rough shape you're in, I figured you finally defeated Aufheben.
(I told Asia everything I knew)

...I suppose that summoning Aufheben probably did require a help from Dunas. If you think of it that way, that solves a piece of puzzle.
But why was Dida looking for Marr? I'll have to read into Arcasia Chronic for more information.
In the mean time, you should really tend to your injuries for today. Thank you, thank you, and thank you.