Sometimes things don't go according to what one expects, for example Alice didn't hold onto Aster just because she wanted to be close to her brother, although that was the main reason, she also did it because they didn't want to separate while they were traveling through the space to the secret realm.
Unfortunately, it seems like the one who created the entrance didn't want people to enter in groups because the very moment they entered the portal Alice disappeared, Aster immediately reacted.
"Sis!!!", but when he was about to use the manifestation of the paragon body, everything changed, if he had to describe the rest of the travel since Alice disappeared, in one word it would be "horrible", everything was blurry, his body moved chaotically and there were so many changes in the illumination, that Aster's eyes eyes had no time to adapt before it changed again.