I will ease your mind of the subject, though I know it will not be the answer you seek.

[Jakurai hates being the bearer of bad news, but, sometimes you have to be in these situations.]

Doppo-kun doesn't remember Lunatia, he doesn't remember any of the time spent there. So that leads me to believe this place was selective on who received what memories from where. For Doppo-kun and Mad Trigger Crew...they haven't any idea of what we went through there. But you and I, as well as Amemura-kun and Megumi. We are all stuck remembering places of times past.