Well Houshou seems to be enjoying the view.

Possible DDs that I can identify:

Shinikami
Shirayuki
Miyuki
Hatsuyuki
Isonami
Uranami

Also is that Houshou looking on in either disgust or keeping an eye while they settle their urges?

EDIT: Looks like I was very close to positively identifying all the DDs and also got Houshou right...

ToastedWaffles said:
Also is that Houshou looking on in either disgust or keeping an eye while they settle their urges?

I'm seeing a slight smile there on Houshou. Voyeurism may be her kink

Houshou: Seishun dane...

Hatsuyuki just lazily taking it, just what i thought.

celdak said:

Hatsuyuki just lazily taking it, just what i thought.

Is she reading a book or playing with her phone or something? Looks like she's doing one of those things while Fubuki goes ramming speed on her.

Miyuki seems to be waiting her turn.

Who just drinks straight from the kettle

DominantReverse said:

Who just drinks straight from the kettle

That caught my interest too since I watched Prison School. I have googled it around in Japanese, but only found that drinking straight from a kettle or a bottle is considered bad manners.

So I've given it a thought myself and that's what came out: if we imagine some dirty and sweaty space far enough from the tap (like on this picture) where people need a lot of drinking water, but no 'luxuries' like cups or jugs - then only a kettle or a plastic bottle comes to mind. And, AFAIK, the Japanese are not the type to keep used bottles. Also, AFAIK, they don't usually drink mineral water, since tap water is safe to drink in Japan, so plastic bottles are only used for soda and sports drinks. And, like that, only a kettle is left for storing large amounts of drinking water. And they drink straight from the kettle because it's too much pain in the ass to pour it into a cup anyway.

@.k1.38e+23 said:

-snip-

Water bottles are a thing, and bottled water is being sold at convenience stores for cheap. (iirc 2L water is 150円)

It's still likely though that the kettle was the largest water container they had around, given the oldschool setting.

shade_30 said:

Water bottles are a thing

Didn't know they meet demand. Da moar you know.

I've seen a couple of characters drinking from a kettle, I bet is a way to portray "extreme thirst quencher".