While the gameplay in this one isn't the most exciting, the Animations available here are pretty incredible and I was very impressed with whats on display here. If you are a fan of machine rape then this game is perfect to satisfy that fetish.
Disclaimer: The whole games premise is that you are using machines to make this girl orgasm so that at the end of the day, you can inject her with "Memory Jelly" into her ass which absorbs the memories of her body (yes this is the lore) and then she shits out the jelly after a final climax so that the researches can analyze her memories afterwards.
This "Personality Excretion" is a pretty niche fetish which might be a turn off for some people. This happens 3 times at the end of the first 3 days, and again at the ending so it is worth knowing beforehand if you want to skip through it. I'm not too bothered by it, but it's worth warning about.
Also, this is all Machine rape. Mirai is never once fucked with anything besides machinery, but hopefully that should not come as much a surprise.
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The game is divided into the Visual Novel style story which are usually stationary stills of the characters and generally don't take up too much time, but then move into 3D Animated videos either with the gameplay or important story moments.
The gameplay loop here involves using multiple different machines to raise Mirai's pleasure and develop each of her body parts. The game is divided into 4 seperate "days" which each have a turn limit. Each turn, you have a set amount of "AP" to use on machines so you must choose which machines to use each turn with an orgasm being caused when you use a machine that depletes your AP. This results in "Orgasm points" based on her pleasure, body development and the machine itself.
Of course, the more powerful machines like pistons will not work as well at low pleasure and cause her a lot of stress. If she has high stress (over 70%), then the points you get for the final orgasm will be significantly reduced. As such, your goal is to first use low stress machines to raise her pleasure and then end with big machines for points. It is also important to ensure all four body parts are worked on as it increases her overall pleasure and makes it easier to get bigger orgasm points. (This body development resets at the end of every day)
You can consider this a sort of point and click puzzle game trying to manage the multiple different resources and getting the most Orgasm value possible each turn so that you meet the Quota for the day. You can also develop new machines with points gained from your efforts, although these are locked to each day.
If you aren't doing a challenge run for the achievements then you shouldn't have much issue beating the game as long as you understand to use low stress machines first and develop each body part equally before making sure you use a machine with a High orgasm value as the final use of your AP.
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The animations though... the devs here did an incredible job with how they animated Mirai and all the machines. Each machine focuses on specific body parts, and there's around 20 different machines over the 4 days. As Mirai's total pleasure rises, so does her animations where she will basically be extremely horny and react different to the machines assaulting her.
For me at least these are extremely satisfying especially at 100 pleasure. She also gets different animations for orgasming with each machine, since you can only do that if it is the final machine you use to use up your AP. There is quite a lot of Ahegao and squirting here, which is something I find quite appealing.
Some examples of machines include a Magic Wand, Pistons, an "Acme Laser" that causes her to instantly orgasm, Hypnosis machine and one of the later machines is a robotic worm that travels through her ass and out of her mouth. For exclusively machine rape, there is quite a bit of variety.
One slight downside though is that Mirai is always in the body suit you see in the images. She is never truly naked (which has a story reason behind it) and that is a slight shame but it didn't detract from my experience.
Also, some of the animations are incredibly absurd. This game does not take itself seriously at all, and you'll quickly see this when you get to the part where she is surrounded by 100 mirrors so they can bounce a laser off of them to hit her with an orgasm laser.
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Translation wise you can tell with the story dialogue that it has some rough areas, but a good enough job was done that you can understand how to play and what is going on.
The story itself was at least somewhat interesting, although not everyone is here for that. I do think the reveal as to why Mirai is able to survive having her memory extracted multiple times and also why she can't take off the robot suit was kinda interesting, although as I mentioned earlier this game does not take itself seriously at all and has a lot of humor thrown into the mix.
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Overall, I'd give this one a pretty high reccomend if you are interested in machine rape. Obviously though take my disclaimer at the start of the review into consideration, but if you don't mind the gameplay then I think this is a really good experience.
FINAL NOTE: You can only get access to the "Free Play" mode where you can freely mess with the machines and animations if you get 11 achievements. By default, you get 4 for beating the story and 1 for failing any of the days. 5 more are gotten if you get her to orgasm 10 times with a specific body part. The final 5 are challenges such as "beating the game without increasing your AP" or "never use an anal development machine".
My reccomendation for this is to avoid using a continue throughout the whole game (just reload a save if you fail) and then when you beat the game you can unlock Endless Mode which means you can use whatever machines you like and stress her out with no penalty. This makes it easy to get her to orgasm with whatever body part you need. Alternatively, find a save and use that instead.