Haruko-san No Naka (“Inside Haruko-san”) [English], by Minato Fumi
… wow. That one blew my mind, HATS OFF!
The story starts with a girl waking up in an unknown place, in an almost unknown body. Memory loss being the word: suddenly, all her memories of becoming an adult 32 year old woman in a happy marriage are missing, she’s back to only remembering being a highschool girl.
Her husband is kind and accomodating, fortunately, but even then, what a shock, discovering your body is all grown up and is now used to wanting plenty of sex…
There’d a lot more to say (and that ending! MIND BLOWN), but spoilers are evil, you know
Graphically, that was also excellent, drawn with skill, experience, and originality. Even if you didn’t care about the scenario at all (but come on, you read Hentairules at the moment instead of a random hentai aggregator, give me hope ^^ ), if you’re just after a casual fap, Minato Fumi delivers solid quality
This hentai gem was released by Wataboutumi and Nero, I can’t thank them enough
By Minato Fumi, I also share: A Borrowed Thing (Uncensored version!), Chiisana Kuma + Big Teddy Bear, a pack of 4 works (I Have A Favor to Ask Senpai + Konna Koneko Irukana + Lovely Neighbor Stay Overnight + Private Standard), a pack of 3 works (Don’t Touch Me + Gekkeisyou + The Look Of Love), Rape-Worthy (belonging to a big pack of short full color works from various artists), Sweet 10 (it’s not loli, pervs!), Runawy Cousin, Until We Meet Again + Warm Bonds, One Play and Charming + Docchi Docchi Which Is My Boyfriend.
And now, the download & gallery links 
Open the Complete Pictures Gallery
Download the Free Hentai Manga in a Zip file
(14 MB, 29 pictures, English)
Or you can also use the Alternative:
Zip Mirror #1 – or – Zip Mirror #2 – or – Zip Mirror #3
im dumb, can someone explain the ending to me?
Either time travel or a premonition of the future
As sir Pavlov pointed out, it is indeed a stable time loop. If you wanna see something similar, there is a netflix serie called Dark, its german made, and it involves something like this, and it is very interesting.
Just tought i’d slip this little recommendation, dont mind lil ole me
Turns out it wasn’t really amnesia, somehow young-Haruka time-slide into the body of old-Haruka for a few days. After she went back, she remembered just enough to be interested in meeting her future husband (so they’ll get married) but probably she’ll never tell him about it (so he’ll act the same way as at the first of the story). Basically, it’s a https://tvtropes.org/pmwiki/pmwiki.php/Main/StableTimeLoop.
You’re not dumb, you probably just haven’t read enough science fiction.
Good job Pavlov
There are also the recursive elements to the girl’s personality.
Beginning: not interested in sex.
Husband mentions: she was very interested in sex when he met her.
Returning to her highschool age body, seeing future husband: “that dick WILL be in me”.
See the thing? Her own stable time loop determined her mental state, it’s a self-fulfilling prophecy applied to personality traits.
Excellent point, didn’t think about her personality change! Also, I was wrong about the story taking days, looks like it was just 1 day.
Short and simple response to this one:
http://memes.ucoz.com/_nw/40/60710606.jpg
Trying that again:

Time Hump Chronicles, The Hentai.
Nice job, Pavlov, but I’m still going to put down what I planned to say:
Loop de loop.
Very sexy as well.