Thank you for the recommendation, the cover looks great. I'll watch it soon and try to understand the plot. My Japanese is quite low-level, but maybe I'll manage to get the gist of it
(Disclaimer: I only listened somewhat in full to the very beginning, on the phone, and skipped around the beginning of the first scene)
Okay, so, in the very beginning, when the phone rings, she says that it's "M Girls' Lab Deep-Throat General Hospital" (喉奥総合病院; I didn't actually know the term for "general hospital", so that's useful; at first I doubted that that's what she says, but this is also duplicated on her name tag, which you can see quite clearly in the first scene), and discusses a new appointment. Then we see that guy who called, I assume, she gets his blood pressure, then asks why he hasn't taken the medicine (not sure what it is for), he says that he's been feeling uneasy (presumably from the hard-on, duh), and then she says that she'll help. And the action begins
So, basically, it's the light-hearted premise of having a special hospital where all your health troubles are resolved with some quality throat-fu...kery. Not sure how that would help with a bone fracture, for example (besides the you-know-which bone), but yeah... Very close to the "Semen Collection Ward", though I'm not sure why she collects the semen here (though it's always a good touch... and at the very least, she's a nurse, right, and that's a medical thing to do)
(I would say that knowing even that much is enough since before I listened to what she says, I thought that they're blackmailing her or something... you know, the usual story of a lot of the deep-throat JAV). Not sure how it gets to the line-up scene; we'll leave it for later