The girl is YoRHa No.2 Type B, a battle android from the video game Nier: Automata. She dances on a stage in a mini-dress, while also (oddly) dancing nude on a huge screen in the background. Same movements, in synchrony.

The song's quite good. No sex, just nudity.

The anime aired in three versions, with different voice actors.

BROADCAST TV VERSION (3 minutes)

25-year-old Hana Natori is pretending to be her cousin, a high school student. If she doesn't, her cousin will fail the year and have to repeat it. (That sounds like the right outcome to me, but Hana would feel bad for her cousin.) Anyway, Hana runs into:

(a) a bad boy who wants to shag her and says "you're doing it with other boys, aren't you?"

(b) a teacher who knows her. They went to school together.

We see nothing bad happen.

UNCUT 18+ STREAMING VERSION (6 minutes)

I'll let you guess.

Keep watching: yes, I was mesmerised

One-line summary: a girl talks to camera

That was really weird. It's like self-help support therapy. But with masturbation. And that gentle, softly spoken lady might be Satan. (She's wearing a crucifix, but she's got red eyes.)

How are you feeling, my lovely kanja-san? Breathe slowly. Find your inner peace. Relax. Now drop your trousers. Yes, get it out. Remember, difficult and painful things are best released with bodily fluids. Sweating, crying, making yourself hoarse... no, just breathe calmly.

She's fully dressed throughout ep.1, by the way. (She gets naked in ep.2, though.)

Now, for a language lesson. (Japanese only. I'll let you google "JOI" for yourselves.)

KANJA could be one of various homophones. It could be a patient, observer, spectator, spy or (archaic) young person, possibly come of age, or young servant. Or else "wicked person" or "evil thing". We have no idea which one of those she means.

Anyway, she's like a therapist. Or even a hypnotist. Even when giving a hand job and talking dirty, she's always soft-spoken and gentle. However the title does call her the devil, while the episodes end with her saying:

Ep.1: "You're now mine."

Ep.2: "I know I'll see you again. I'll be waiting."

The title screen shows female demons. Horns, wings, etc. Probably succubi, all things considered. They've both chosen the same sex victim.

No animation, just still frames and voice actresses.

Our heroine moved in with her younger brother after the death of their mother. Naturally she wanted to protect him from all those sluts... by having sex with him herself. One day, after school, she dressed up in an outrageous outfit and ambushed him with chains and handcuffs. (What's the point in a transparent top if you strip before he's even seen it, eh?)

The "good" news is that the brother's receptive, so soon they're going at it like rabbits. The episode also throws in a terrifying X-ray fellatio shot that looks like an autopsy.

There are four episodes of this. Another girl will show up.

Hatsune Miku dances for less than a minute, then does as promised. Afterwards, she rubs her tummy.

This is actually taken from a computer game. The publicity art for the main character is cute and characterful, but the actual scenes are CGI with creepy mouth movements.

Also, the girl has a penis. (As well as boobs and horns, being a succubus.)

We meet a striking lady with dark skin, purple hair and a crown. Her outfit's cool, while she's still wearing it. The planet Earth is being displayed on viewscreen walls.

She dances and has sex.

It's barely animated and almost all of the dialogue has been muted, so you've got to read onscreen text to know what's happening. In Japanese. What's more, that's actually necessary. It looks (and is) pretty rapey at the beginning, but in fact the girls were playing the King Game and voluntarily going along with the game orders. Kozue took off her own top, for instance.

It's still disturbing, though, especially with those men filming it all to upload to the internet. Later, a boy's web-surfing. He's found a site with videos of two nice schoolgirls he knows: Kozue and Yumi.

ONE MINUTE (PG-rated) = a nice schoolgirl helps her little brother with her homework.

THIRTY MINUTES (X-rated) = when he's not around, she likes having group sex with bikers who take mobile phone videos of it.

This video only has "motion comic" pseudo-animation, while the the voice actress's script was simply "moan a lot".