https://vndb.org/v24696 By Atelier Sakura is pretty much available now, got my hands on it, here's the summary and my thoughts.
Summary (based on my understanding obtained through machine translation):
3 main characters: Kazu (main character), Naomi (MC's wife) and Kou (MC and wife's childhood friend) these names are pretty much the nicknames they all call each other.
Story starts off with MC banging his wife but it ends pretty quickly. Wife comforts him about it but he's pretty insecure about it since he and his wife are in their early 20s and the MC feels like his libido's already dying. MC knows the problem ain't his wife and he frequently comments on her beauty so all he knows is that its his fault. After their night of sex, MC wakes up thinking of his childhood friend that he and his wife played with as kids (presumably until their mid teens) . Coincidentally, the wife also had the friend on mind recently. MC goes to work and on the way back in the middle of the night he spots the police arguing with a suspicious person who the police claims he hasn't seen around the neighborhood. MC steps in to check out the situation and finds that its the old childhood friend Kou-chan. MC brings friend to his house where he reveals he hooked up with Naomi and got married, the friend happy for them. As the friend and Naomi interact its pretty clear they have a rivalry going on, the friend frequently commenting on the wife's beauty (or his perceived lack thereof) and the wife not appreciating the comments and the friends pretty laid back and quite childish personality. Reunion is going good though and MC allows friend to stay over for an indefinite period of time.
Cut to next day, MC talks to his friend and wife and then head off to work but silently notes in his mind how he left his wife alone with a man in his house, but he assures himself that Kou is trustworthy. MC comes back home at night and the three have little drinking party. During the drinking party, the MC lets out his insecurities regarding his poor sexual performance to Kou and shortly falls asleep later (presumably because of all the drinking). He wakes shortly after only to see his friend getting comfy with his wife and fingering her, MC's can't move though because of the alcohol and falls back asleep. Next day, everything is fine but the MC talks to his friend on what happened last night. Friend reveals he's pretty sexually active and has dedicated himself to correcting the MC's sex life. MC actually accepts his help.
That night, for some reason, friend suggests that they all have a group bath like they used to as kids and everyone is actually cool with it (the wife usually rejects at first but goes along with a little push). In the bath MC and friend talk then as the wife is about to enter with a towel covering her bits, friend intercepts and gropes her in a somewhat friendly manner. (dude acts like a child so its hard to really understand at what point he's making advances or just being an idiot) After the fondling (that the idiot MC doesn't attempt to stop) friend recommends that wife gives them both a handjob and for some reason, it actually happens. MC is actually erect and feels turned on, handjob is a success. Friend calls it a job well done, convinced he's restored the MC's libido and goes about his own business. For the next few days, MC's back to trying to bang his wife but he still has poor performance again. Friend catches wind of this and resolves to solve this. Next day, MC has a dream of a place that he cannot remember. Same day, friend takes MC to that place. Turns out it was the secret base of the three friends. MC feels like there's something he's forgetting that has to do with the base but calls it quits. That night friend convinces MC to bang his wife while said friend watches. Deed ensues and MC once again had no poor performance to which the friend says that maybe his sex life is a bit bland and he needs some spice.
Shit's back to normal, MC gets another dream of the same place though and sees his wife getting banged in the secret base but the dream cuts pretty early before the MC can get anything from it. That night, friend still attempting to help MC with his sex life and suggests wife use her secret weapon AKA her mammaries. Wife doesn't really see that happening when suddenly friend decides to give the couple a live example by going ahead and using her tits for a boobjob. Things get sexy and threesome ensues where MC bangs wife while wife blows friend. MC's dick is performing its best. Later, next day, MC brings friend back to secret base and confesses that he may understand why he only gets super aroused when friend is there, a̶n̶d̶ ̶t̶h̶a̶t̶'̶s̶ ̶b̶e̶c̶a̶u̶s̶e̶ ̶h̶e̶'̶s̶ ̶g̶a̶y̶ and its because the dream the MC had of his wife getting banged in the base was the friend taking her virginity. Upon seeing this as a teenager the MC ran from the scene and much of his life after that was blank. he didn't pay much attention to the friend and before he knew it, he got married to Naomi and the friend had left the town. So MC basically suppressed his memories of his wife being deflowered by his friend in highschool (though they weren't in a relationship at that time). At this point, MC says that he wants the friend to bang his wife and the friend at first can't really believe him but the MC convinces him that he's serious and proclaims his love for his wife to let the friend know that even if he wants her to bang the friend, he still loves her. Friend agrees and later that night they talk to the wife about it. Wife agrees with the condition that the MC is in the room while she bangs the friend.Midnight comes, friend and wife reconfirms MC's feelings on this and then they get to 69ing each other. Friend that lines the wife up so that the MC can see everything when they start to bang and he asks the MC one more time if this is what he wants while taunting him a bit (friend is out of character in this moment).
At this point there's an option:
MC decides that this isn't what he wants and he bangs his wife right there. MC seemingly overcomes his subconscious problem and takes his wife. Next day, friend congratulates the couple and leaves the house shortly after, saying his work is done. Few weeks later, MC is banging his wife and they're talking about having a kid. - Vanilla End
On the other hand if the MC goes through with it, the friend fucks the wife in her ass instead, surprising everyone. After banging the wife, next day happens and the friend brings MC to a room to have a private talk. He confesses that the reason he was taunting the MC was because he was hoping for the MC to take the wife back (AKA vanilla ending) and the wife may or may not have been in on it. That's also why he only banged her ass instead as it was his way of saying that he hasn't gone all the way yet and that the MC can still rethink this. MC reconfirms his love for his wife to the friend but says that he's content with the way things are now, that is with the friend banging the wife. Friend gets up suddenly and drags the MC's wife into the room and tells him that he's going to have sex with her for real this time and lines her up to take her pussy in front of the MC.
MC gets another choice at this point:
MC has a sudden revelation and tells his friend and wife that he wants to solve his problem, friend is happy and clearly has the best interests of the MC and the wife in mind. MC convinces the friend and wife to follow his to the base and says that he wants a threesome with the friend and wife, Everyone agrees and double penetration of wife in a dusty old shed ensues. Everyone is happy. Cut to a couple weeks/months later and MC reaches home from work at night. MC sees that the lights are off but hears his wife in a room panting. MC sees the friend banging the wife with both pretty into it and makes them aware of his presence. Turns out the MC and his friend has sex with his wife most times (with the friend banging her more since the MC usually has work) and everyone is fine with it. MC loves the arrangement but has some doubts in the back of his mind, the wife pulls him from his doubts and tells him to join in. MC agrees. - Threesome Ending
The other choice has the MC simply allow the friend to take his wife and bang her in front of him. MC confesses that he believes he can't satisfy his wife and that he wishes for his friend's and wife's happiness, even if that means that the friend becomes the wife's sole sex partner. The friend admits that he had some lingering affection for the wife but has the best intentions for the MC in mind so he has sex with the MC's wife everyday. cut to a year later and the MC stumbles into his house after a day of work and sees his friend banging his pregnant wife silly. MC sits down and watches them have fun, content with his weird marriage. - Friend fucks wife ending
Overall the game was pretty bland. The ntr was pretty weak and the wife had little character. She spoke very little during the sex scenes and I honestly at some point in the game, thought that there was sexual tension going on between the MC and his friend. The only good points of the game are the threesome ending and the friend ending and that's simply because the wife actually talks a bit more and seems pretty into the sex. Typical Atelier Sakura game. What gets me most though is the game cover with the wife looking all seductive and that she has more place in the actual cheating. The fact is that she is pretty bland and mostly moans during sex scenes. Feels like the game focused way more on the MC and his friend than on the actual wife.