On a side note, even before the return of the stolen comics, multiple manga fans from around Japan had sent in their own Demon Slayer volumes as donations to Onsen no Mori, with the facility receiving some 140 books.
“On October 13, all volumes of Demon Slayer were returned by the person who took them.
Yamaguchi City’s Onsen no Mori hot spring facility has a relaxation room with free manga to read.
I think the person who took the manga felt the same way, and we caused them emotional pain.