トイレの花子おばさん (Pixiv Fanbox)

小学校のトイレがすっかり近代化されてしまい、居場所がなくなった彼女はひとけの無い古いの公衆トイレに住み着き、噂を聞いて肝試しに来る者をトイレに引きずり込んでいる。

The elementary school restrooms have been completely modernized and she has no place to stay, so she takes up residence in a deserted old public restroom and drags anyone who hears a rumor and comes to test their mettle into the restroom.