A Bath Stool is a stool kept in bathrooms. While such things have been used to prop feet up for using the toilet, they are generally known in anime to be used to sit on during Furo sessions. Sometimes an upturned Bath Bucket is used.
1982 (Aug 26) Maicching Machiko-sensei episode 47 has YELLOW
2002 (October 2) purple-haired woman in episode 13 of El Hazard Alternative World sits on a wooden one.
2003 (month unknown) Kinjirareta Asobi chapter 2: one is visible in the room when Nana-chan enters to bathe with her dad
2005 (August 16) in Akahori Gedou Hour Rabuge episode 7
2011 (April 15) Fairy Tail OVA/Episode 1
2015 (August 6) Okusama ga Seitokaichou! episode 6
The Disappearance of Haruhi Suzumiya: In the alternate world that Kyon gets stuck into during the movie, He hears a conversation while having dinner at Yuki Nagato's house where Ryoko Asakura asks Nagato (who is a normal shy human girl in this universe) that they should check out some Bath Stools because she noticed that Nagato's bath stool has a crack in it.
This reveals that this alternate universe human version of Nagato has Furo sessions and uses a Bath Stool. It also implies that Ryoko Asakura may have possibly bathed Off Screen at Nagato's house on a more recent occasion for her to notice that crack in the bath stool.
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