Our hero wakes to a blaring alarm, only to discover that Miia, a Lamia, is curled up in his bed. She claims to be trying to warm up, but her coils are so tight our boy can barely breathe. Trying to get her to release him he grabs the tip of her tail.
The opening shows our boy having haremlike close encounters with a half dozen busty monster girls
Miia is here on an interspecies exchange program. Once the government stopped keeping the existence of demi-humans secret, the program was set up to help them integrate.
Our boy is Kimihito Kurusu, and he seems to have accidentally become a host family while his parents are away. Oops. Some kind of paperwork screwup, no doubt.
Smith, the interspecies coordinator drops by. She's noticed that Miia is desperately in love with him.
She's here to remind him about the Prohibited Matters: any injury to the guest is strictly forbidden... and under the current interpretation of the law, deflowering counts.
Not to mention, as the first Lamia in Japan, it would be a diplomatic incident!
Miia attracts attention on the street. Some inquisitive, some rude. Kurusu stops her from getting in a fight: the Prohibited Matters go both ways and if she injures someone she'll be deported.
As they retreat, they are met with more mockery, and Miia gets mad. Kurusu determines that while the Prohibited Matters will get her in trouble if she overreacts, there's no law against _him_ punching that asshole in the face.
Miia asks him why he did it. Kurusu replies that he couldn't let someone be cruel to a girl like that.
Miia is overjoyed that he truly sees her as a girl despite the species difference and is DTF right now. Only Smith deciding to impose on them for dinner keeps them out of jail.
Centoria Shianus, the Centaur with a passion for justice, hunts down a purse snatcher that has been terrorizing the neighborhood. Of course, due to the Prohibited Matters, she can't actually fight him. She needs a patsy. Kurusu will do nicely.
Miia is molting and having trouble. Can Kurusu lend a hand? (Yes.)
Papi is going to lay an egg. A documentary filmmaker/pervert wants to film it, for science. (Or so he says.) He goes too far and gets thrown out on his ear.
A gang of violence orcs have taken over a Doujin shop, and taken the employees hostage! They demand all adult manga shift their primary storylines to Orc x Female Knight.
They're hiding behind the Interspecies Exchange Act -- use of violence against them by humans is illegal.
A second threatening letter appears. It's almost romantic in its tone.
The girls from MON want to solve the case right away. Also, they're sick of watching Kurusu go on dates with the other girls. So now he's going to date them! (Shenanigans ensue.)
Taking this as a threat, the other girls decide to evac Kurusu to save his life. But they're not really safe on their own. He's probably in more danger from their help than anything else.
But Lala the Dullahan isn't a Reaper of anything. She's just chunibyo.
I can thoroughly recommend this to the horny nets who flip their Monster Manual between the Succubus, Nymph, and Dryad entries because they can't acquire real pornography.
I'm really not sure who I can recommend this to that isn't already aware of it.
Side question: is Miia a tsundere? She almost fits the violent variant of that archetype, but her violence is never directed against her love interest.
The opening theme reminds me of the opening from _Gabriel Dropout_ for some reason. Probably because it's sung by the full cast and a bit over the top.
The second note was written by a Dullahan who has lost her head.
Kurusu and the girls help find it, and befriend her.
But she is a reaper of the dead and pronounces that Kurusu is at death's door.