No, translation is actually pretty good.
Yeah, it looks pretty solid.
But I've noticed something else, and maybe this is something that I hadn't noticed before but I certainly do now. That is, the writing is pretty lazy and over reliant on the voice acting. I just got up to the Miki-san masturbation scene, and it was page after page of 'oohhhh' and 'aaaahhhh' while the voice actress sounded like she was having a good time. But what was she actually doing? Whereas a well written game would take the time to flesh this encounter out and describer her actions, like you see in
Now & Then or
Pale Carnations, this game doesn't do that at all. Is Miki-san rubbing her rosebud? Using fingers for penetration? Tweaking her nipples? No idea. The voice actress sure is moaning a whole lot, that's all I know. Kinda disappointing really.
EDIT: Okay, I wrote that when the scene cut back to the MC spying her in the hallway, and I thought it was over. I thought the game was gonna pace itself. After spending the time to establish that the MC felt guilty about finding his sister-in-law attractive to the point of jerking off to her, I thought the game was gonna build up to their first encounter. NOPE. He stumbles into the door and into the room, then it's all aboard the RAPE TRAIN! Every time I thought the game was gonna have the MC come to his senses and pull back, he doesn't. He goes right into motorboating and licker her breasts, finger-banging her, then right to fucking. He goes from shy and conflicted, to full on mindless pervert rapist at the drop of a hat. Just, ugh...
Also, this game absolutely needs the Rape tag. That first encounter, Miki-san is repeatedly telling the MC to stop. There is even a point where the MC says something along the lines of 'I'm so happy you've accepted me making you feel good' and she responds with 'I haven't accepted anything!'. When your patterner tells you repeatedly to STOP, and you don't, that's RAPE. Tag it properly please. This isn't seduction and corruption of the sister-in-law, it's raping her like a braindead brute.