[quote=@Sho Minazuki][...] Ayano and her family is currently the only one who knows Chiaki is missing.

Except for the dungeon party, but we're still not sure who's in the dungeon, but it's familiar.[/quote]

Well, unless Ayano told the girl who showed up right after Chiaki disappeared.

Not that that would look in any way suspicous. At all.