It's basically a very short kinetic novel with a small degree of interactivity. Playing normally, I unlocked everything by day 25, it took me a couple of hours. There are 3 or 4 animated/interactive sex positions (depending on if you count the sleep molestation) and a handful of CGs. Not a ton of voice acting, it's mostly just moaning during the sex scenes and the occasional voiced line (usually when cumming).
Lightsaber-censors on the penis and mosaic/smear on the vagina unfortunately, but the framing and application made it feel not as bad as some other games. Many of the CGs only imply penetration without showing it, so censorship isn't an issue there. During the interactive scenes, the censorship didn't really bother me, the mosaic is subtle so you can still see the borders of objects unlike some other games where any penetration just looks like a big pixelated mess.
The interactive sex scenes don't have a lot to them, you mostly can't do anything besides remove/put on clothes, go slow/medium/fast, and cum. You can choose when to cum as long as your pleasure gauge is full, you can hold it forever, and it seems like you can cum as much as you want. Sis only has a pleasure gauge for sleep molestation, in the other scenes it seems like she cums when you do. I really liked how the art and VO changes as you cum more (her clothes and skin get sweaty, her moans get more intense, her O-face changes, etc).
The sleep molestation has more interactivity than the other scenes, surprisingly. You don't have to worry about waking her up, but you can remove her clothes to different degrees (as opposed to the binary clothed/naked option of the sex scenes), you have many options for where to cum (instead of just inside/outside for the other scenes) and sis has a separate pleasure meter.
No tedious mini games, thankfully, just click the "work" button to get 5000 yen and pass the time. There aren't really any time constraints either, except for two scenes that you can only unlock after day 15 and day 25. The prices for items are reasonable, so I never felt like I was grinding (not like grinding in this game is that annoying, anyway) and I was able to buy most things as soon as they were made available.
Many of the scene/screen transitions are a bit too slow, and that frustrated me for a while, especially at the beginning when you're just doing the same thing over and over to raise affection and having to read the exact same dialogue over and over. Once you've gotten over that initial hump (around 25 affection?), the game picks up momentum.
Overall, not a ton to do, you just work when you want money to buy stuff, most of the items are just for raising affection but some of them unlock CGs or new interactions (you can check the album, it tells you exactly what to do to unlock everything). The interactions between the characters are pretty cute, and the story is mostly just fluffy domestic teasing. Worth playing if you enjoy the character archetype, but like I said earlier there really isn't much to this game. I enjoyed my time with it, but that time was pretty short. Not sure if it's worth the $10~ asking price, but if you get it for free, it's not a huge time commitment.
If this type of story/character appeals to you, you'll probably enjoy the game. If not, there are probably better options.
