Chat Group: No Matter How You Think About This World, There Are Problems

[Visible Girl + Demon Slayer: Kimetsu no Yaiba] Lin Yi traveled through time. He traveled from the earth to a parallel world called [Blue Star], and awakened something called [Chat Group]... But... He is a modern social chat group in the 21st century. How come all the members in it are members of the Taisho period? Apart from that, what were those ugly entities with black air that wandered around the streets that he could see through the chat group? I took a photo and showed it to my friends, who all insisted that it was a ghost. Of course he knew it was a ghost. How could a normal person be covered in black energy? The group of friends said that they were professional demon slayers. The group of friends also revealed the secret to killing ghosts - as long as the ghost's head is chopped off with the Nichirin Sword, it can be destroyed. The group of friends thoughtfully sent Lin Yi a sun disk, hoping that he could destroy ghosts. But, having said that... ​Are the ghosts mentioned by friends in the group really the same creature as the one I saw? Lin Yi stood at the door of the room holding the Sun Blade, looking at the ghost squirming under the quilt on the bed. ​Confirmed a fact—— In this world, there are problems no matter how you think about it. …… (PS: I prefer daily writing, write whatever comes to mind)