Reito is a boy who gets taken to Wonderland. There, he finds a scarecrow and a succubus standing on guard at a castle's front gates. (Isn't a scarecrow more Wizard of Oz?)

"Uhh, the queen has been acting selfish lately," complains the succubus, before giving the scarecrow a hand job. "She makes a low-rank sex demon like me work as a castle gatekeeper. She immediately wants to execute anyone who talks back to her. And she gets angry over the smallest things."

Reito is small, gormless and accommodating. He meets good-natured succubi who think he's cute and want to look after him.

Two married women in their thirties (Kaoru and Satsuki) go to a hot spring together to get drunk and grumble about their useless husbands. She wants him to pay her more attention, but he'll break his promises in order to work late and at weekends. They meet three men... and fall asleep.

When they wake up (still drunk), they're being gang-banged. Thereafter things keep going downhill, with very little consent and an unattractive art style.

It's Goblin Slayer without Goblin Slayer himself. There's no one to kill the little green guys and protect women from their rapist attentions. They have all the revolting habits and reproductive habits they had in that series, except even worse because this is hentai and so it's being explored in detail. (In addition to slaughtering a party of travellers, obviously.) They even look the same as in that show.

This episode's heroine becomes a pornographic Scheherazade. Can she keep entertaining the goblins enough to survive? She has to fellate them while surrounded by her friends' fresh corpses. She's also religious and prays to God for forgiveness.

It's dark, obviously. The ending's less bleak than I'd been anticipating because the girl decides she likes gang rape and being used as a goblin brood mare, but it's still pretty damn twisted. Oh, and the narrator in all four episodes is an upbeat, well-spoken lady who seems happy about what she's describing. Each episode is the same, but with a different girl. 1 = blonde priest, 2 = pink-haired mage, 3 = purple-haired swordswoman, 4 = grey-and-pink-haired paladin.

Anyone finding all this arousing is a sick, sick bunny.

It's an anthology series, with most of its episodes focusing on a different couple. Episodes 2 and 3 are a two-parter, but otherwise everything's a one-off. These are light, happy, consentual and sometimes even amusing. Nothing wrong with them.

...is the old hentai staple of an unpopular nerd and a flashy gyaru who's assumed to be a hard-partying good-time girl with lots of sexual experience. Her name's Asukai Ena. "She's the kind of girl I don't want anything to do with!" thinks our hero.

As it happens, though, he's promised to help coach her through her exams. Not only is Ena grateful, but she genuinely likes him and will get possessive when her gyaru friends start pushing their luck with him in front of her.

Good grief, these two. Takaya's the heir to a distinguished family and Anri's his personal maid. They're childhood friends, but these days she's businesslike to the point of chilliness... until he finds her on his bed, masturbating. This becomes comedic when we discover Anri's chutzpah in brushing it off.

"The future head of the house gets turned on by peeping. How pathetic. And a pervert like this will become our master?"

"You're the one doing that stuff on someone's bed!"

"Hmph, it's just masturbation. Doesn't everyone do it when they're old enough?" she says... and then initiates fellatio. "You're the one who pressed it against me. Why are you even surprised?" They'll end up being lovey-dovey (in school, to Takaya's discomfiture, in front of his classmates) and committing themselves to marriage, but that'll take a while. After all, they've got their personalities to overcome.

Tomura Sadahito has a hated enemy! He keeps coming second in exams to Ichinomiya Juri. He doesn't even notice panty shots because he's too busy burning with fury.

Then, one day, she's surprised to find him in the library. "It's noisy in my apartment since it's currently being renovated..." he protests, expecting her to leave immediately. To his shock, she doesn't. His delivery of "Why are you sitting here?" made me laugh. "I need to focus!" he thinks, then yelps on realising that he can see her knickers.

"Well, well..." she says, disappearing under the table.

"You're wrong! You're mistaken!"

Apparently, getting a boy's dick out counts as "getting in the way of a rival". He'd been threatening to catch up with her exam results, after all! Things continue along these fairly silly lines and eventually our heroes become honest-ish enough to drop the excuses. (Mostly. Approximately.)

It looks like a love confession. A girl is bowing deeply and holding something out to a boy in the classroom in front of all their classmates. However, what she's holding is a game controller. "I'm from Warabi Third Middle School. My name is Satoki Ayane from class 1C. Koushou-senpai, please fight me in this game."

Our hero's response: "She's an assassin who threatens my peaceful life!" (He used to be a fat otaku who lived for video games, but then he realised it might be better to start talking to other people instead and maybe also lose weight.)

"All right, here are the school rules for you! Students are not allowed to shorten their skirts and alter their uniforms in general. Next, have a hairstyle befitting a student and avoid anything obtrusive. Now, Toosaki-san. What do you have to say for yourself?"

She's annoyed by the teacher telling her this, because he's a former delinquent and because he's the only boy who's ever rejected her. (They're childhood friends, but with an age gap.) This one's a romantic hentai with a female protagonist and a boy who has some very slight vestiges of self-control. ("Wait until you graduate," he says, but only regarding holding hands outdoors when people might be watching. He doesn't mind shagging his students.)