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Artist's commentary
Fukube Hikaru / In a Bath Made for One
It's a somewhat strange ceramic bathtub. It's built such that only one person at a time can enter it. Wide baths are nice, but sometimes this kind of bath isn't bad. It's like it wraps around you, and you get are put at ease.
Mitsuho-san and company are all together with her though, so I'm not sure how at ease she can be......
https://fantia.jp/posts/1822830
There are variations of this now available there!