It is technical functional, so its not a 1. Technically. Barely. Impressively unfunctional.
Writing:
Everyone else has crapped on the grammar enough, but what they neglect to mention is half of it is fine. Like Tsunade's lines. They tend to be fine. Near or actually fully understandable English. Sarada's are almost always... poorly written... and... overuse... these...
Its actually more jarring than if they were just consistently bad.
The story is bad. You are ???. You have magic powers to mind-control people. You need Sarada to help you with this because ??? apparently the Sharingan helps people use kekkai-genkai now I guess.
That's it, that's the story.
"But what about the SEXO"
Almost entirely irrelevant to the story.
The gameplay:
So impressively broken the dev added multiple in-game cheat options that don't even work.
You can start a new game at like 4 different points in the game. Pick any but the last, and you will just spawn in with default stats and no progress on anyone as if you just chose the standard start. They do nothing. The last one puts girls in a 'harem village'. Except when it doesn't and clicking the option does nothing. Or you go back to konoha and get error messages talking to people for some reason.
Or click your apparently end-game Sarada on your apparently end-game MC and have her suck your poorly drawn dick no issue, but when you use MIND CONTROL she flips out, despite being under mind control
You can add stats, but you have no idea what stats matter when or where or at what number.
'Complete girl story', but it plainly doesn't work at all
Add money, but there's next to no use for it
etc
Without cheating, you have a fairly standard grind-fest. I will give the dev credit for trying to direct people where to go. You can open a menu for characters to see how to move them forward. Its often very vague. 'Spam click sarada at day and forest at night' it says, like 20 interactions before clicking the forest does anything. But it does work eventually unless it just doesn't. The game's like that a lot. Click random things until something happens because like you have 4 stats but you have no idea how much of X stat you need for the next stat check scene. A lot of the time it will say 'me eye is weak, me stats are bad, or maybe ye need more progresse me lad, progresse with whim, I do not know, Sarada I guess, that chick is a hoe'.
And you just don't know. Do you spam click Sarada more? Spam click forest more? Spam click something else more? Who the fuck knows.
And progress is so linear. You need to click Sarada like 15 times before she moves to forest and then you can train her, then click the easiest option a dozen times, then the next down, etc. Want another girl? Alt tab out of game, look up the walkthrhough, then do the exact sequence of events told, as anything else will not work.
The Sex:
The reward for this grindy tedious bullshit in a game where even the cheats used to mask how throughly broken it is don't fucking work right.
Am it good?
No.
The art is poor. Like, so poor that in at least one scene, the dick is floating like 6 inches above even the ass. That's not how sex works.
The dialogue, even ignoring the ESL nature, is just not hot. You could replace most of the girls with a literal piece of meat and it would very little difference.
Ahem!
"Mmmm"
"*Gasps"
"Moan"
That's it, that's all female dialogue during sex in this game. 90% of it is the MC talking about how epic super awesome cool fun times it is. At one point he asks Samui "Do you want my cum" and his next line is "I think that means yes" because writing her fucking answering him is too goddamn hard. Or "Water pipe". At no point do you collect a water pipe in this game. But the mc just "Water pipe"'s on a whim. Its so bad its actually funny.
And the MC is just inexplicably, jarringly... I dunno. I want to say cruel. Or sadistic. But the girls are always mmmm'ing and moaning. So maybe not. But you're often presented with the option to whip them, add cloathes pins to them, etc. It always comes out of nowhere. Nothing about the mc's personality (fucking idiot) or the majority of the girls implies he'd be into this or they would. But they all just are. And he's always just carrying whips and shit with him 24/7 for some fucking reason. And he whips fucking hard. Like, they bleed hard.
Its a shame, the dev does seem to be trying. But he needs help, probably. Because anything he tries to fix it either misses the point (giving Tsunade better English when 90% of the content is Sarada and not touching hers up at all) or just outright incompetant (adding multiple quickstarts that don't function correctly, broken cheats, etc)
Right now the game is just not good at anything. Its poorly written, its poorly translated, its full of bugs, its ugly and the characters are unlikeable.