Oyasumi Sex

There is no bond stronger than the one between siblings. Yui has been the center of her brother's sexual desires ever since they were children. But in recent years, something in their relationship has changed. The divorce of their parents has forced Akira to pay more attention to Yui's well-being, take care of her on a daily basis, and assume the paternal role in their family.

As the two grow older, Akira has taken notice of the physical changes in Yui—she is no longer the precious child he thought he knew. Unable to stop himself, he starts sneaking into her room at night, admiring his sister's body and pleasing himself to her. Akira becomes increasingly frustrated with the distance between them; but when Yui reveals that a friend from school has confessed to her, something snaps inside him.

No longer restricting himself to mere daydreams, he actively has intercourse with his sleeping sister. However, unbeknownst to Akira, Yui remains wide awake during these nightly visits; yet, for some reason, is unwilling to stop him.

[Written by MAL Rewrite]

Tsukioka, Yui Main

Matsuoka, Yuuri Japanese

Tsukioka, Akira Main

Kojita, Renya Japanese

Kinomoto, Natsumi Director

Matsuoka, Yuuri Theme Song Performance

Mikami, Mika Original Creator

Mikazuki, Kougetsu Original Creator

Reviews

Sep 10, 2020

CrimsonX87

Recommended

So.... I wont claim this is the greatest ever.... but as far as hentai goes, it has an interesting story, with an odd dynamic between the characters. I mean... if you were going to fantasize about having sex with a make believe fam member, i imagine it would go something like this ha ha ha.

Also... it really feels like they put some effort into fleshing out the story a bit compared to most H series but that could just be me.

Was totally disappointed when I realized it ended on a cliffhanger story wise. It felt like a natural flow into episode 3 yet episode 3 ... doesnt exist.

Reviewer’s Rating: 10

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Dec 16, 2019

SupremeHentai

Recommended

[SPOILERS]

It's about a brother x sister relationship, the brother feels like he have to act as a father for his little sister, since their parents broke up, but he suddenly finds out that he's falling for her and attack her while she's sleeping, and that's why it's called Oyasumi Sex (Good Night Sex).


Different it's what i can say about this one

You know that incest thing were they make it clear that the sister it's actually a step-sister? Well i don't remember hearing that in this hentai, so well... thats different. Another point is that it shows both perspectives, the brother (who thinks he is doing ... something wrong), and the sister (who wants him to do it, but don't have the courage to say it).

It was good to watch but not too appealing, you might look for something else if you want more "action".

Reviewer’s Rating: 7

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Sep 7, 2025

SakiSamuraiOh

Not Recommended

How is this even fappable material????

When I chose to watch this, I'm already aware that it's hentai. The name of the show is Oyasumi Sex, which literally means Goodnight Sex. I thought I will be watching some regular normal sex every night with MC male joining his girlfriend to bed while doing the Nightly-Tango. But it turns out, its just "Let me Grape my sister every night."

You see the problem here, it was like I was watching something illegal. There's three things which makes me thinks this show is F'd up!

First, they ARE siblings. Not step- Not foster sibling- Not Half- (now that I think ... about it, that's also worse) not even through a far distant blood. They ARE siblings, FLESH AND BLOOD. They both literally came out by the same Vajayjay.

Second, the age gap, imagine how old they were in here. They may not reveal it. But it's obviously CRYSTAL CLEAR, that they're in school.

And the third and final thing, the MC male has admitted in two episodes. That he literally GRAPES his sister every night. (His lucky his sister liked it. But that in itself is still wrong in so many ways).

At the first episode, he narrates how he has to be the father figure to his sister because their father died or whatever. But as they grew older, he notices how his sister is changing (obviously her body). And he (with his devilry mind) admits that something changed in him that day. And that day was the day where he GRAPES his sister every night.

We each get to see the side of the brother and his sister. But base on my perspective, brother GRAPES sister every night which in time sister grows to like it. I don't know about that but that looks to me he was able to make his sister think this is good, and that's because his sister likes him. Look how freak up is that....

The animation is MID too!! It became a chore to watch them freak, I couldn't help but skip every 5s on how boring the SMEXY is...

It's torture I tell you! It's torture!!!

Reviewer’s Rating: 1

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Hentai with a Younger Junior as a partner PART 1

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	This Bull shit have lillegal senc Anti-Pedophile-R - Mar 15, 2023	3 replies	by 5degree »» Nov 5, 2025 12:54 AM
	Poll: Oyasumi Sex Episode 4 Discussion KiliianSleipnir - Aug 18, 2021	15 replies	by hendrybbr19 »» Jun 16, 2023 12:14 AM
	Poll: Oyasumi Sex Episode 3 Discussion fourberie - May 22, 2021	10 replies	by HANDSAMNGPINAS »» Oct 21, 2022 9:06 PM
	Poll: Oyasumi Sex Episode 2 Discussion J_B - May 3, 2019	26 replies	by HANDSAMNGPINAS »» Oct 21, 2022 9:05 PM
	Oyasumi Sex Episode 1 Discussion Lianhua - Oct 25, 2018	16 replies	by Nejima-kun »» Oct 29, 2020 12:15 AM