"Hm... Maybe they're marking their territory?" But that didn't seem right. The new marks weren't layered over Walter's, like they should have been if they were trying to blot them out, and so far, nothing in the cave had seemed to expect an intruder's presence. Manaka straightened up again, casting a quick look around their location, before she moved to step forward.

"Yoohoo~" Cupping her hands around her mouth, she called out into the cave ahead of them. "If someone has been writing to Mr. Ghost, please come greet him now~"

...Well, it was worth a try, wasn't it?