The man call himself Mr. Yoshima. He tells Erwin that he wishes to see the world return to its previous state, as it was a beautiful place. He may no longer be able to enjoy it to its fullest, but his wishes are that future generations would be able to. Does he believe it to be possible? Yes. He has complete faith in restoring the place.

He also gives a permission to instal the crystal. He doesn't mind people coming through, in fact he would love to see a variety of people around. The magical circle is protected by his strong will magic and would be fine even if someone tried to mess with it.