My Sister And I is one of the rare games that features just one love interest. The sister of the MC. It's a cute and overall very wholesome romance, there are no kinks, no flings with sidecharacters, just Claire, the sister.
It's a Honey Select game so you need to appreciate the typical HS aesthetic. Females look cute and pretty, but stylized... male characters can look weird.
However, you will never see the MC, this is a POV game with all the positives and negatives that come with it. So Claire will kiss empty air quite a few times. It is what it is, I would prefer a proper third person view, but quite a few players prefer POV, you can't make everyone happy. But generally speaking intimate interactions are usually greatly enhanced by having a fully visible MC.
The story is a typical slice of life story. The MC has had feelings for his sister for a long time. Eventually he left the family and Claire behind to study in a different town, hoping he could get over her. But to no avail. And then the story begins with Claire moving in with the MC, she's going to college now and becomes the MC's roommate.
Of course things heat up pretty quicky, as it turns out Claire also has feelings for her brother and as of update 0.5d the two even fully consumate their relationship.
One thing I found pretty unrealistic is when Claire talks about her feelings with Amelie, a new friend she's known for only a couple of days. No one in their right mind would do that in that situation. Amelie is of course super cool with everything, but still, that Claire talks about everything with someone she barely knows is a bit of a stretch.
So while the story is maybe not entirely original and at times a bit unrealistic, it's always cute and wholesome through and through.
Where the game falls short is in the technical department. Honey Select renders can look a bit rough sometimes, especially so here. Claire is really pretty and cute fortunately (just check the screenshot), but environments can look a bit rough. Sometimes textures are very blurry, especially on the beach later in the game. The texture used for the MCs penis looks very weird in early scenes, like it's made of shiny plastic. That changes later though!
The game also has animations. But early in the game they are low resolution, suffer from the strict POV approach (Claire kisses empty air...) and camera movement is very jerky and weird at times. Maybe the intention was to provide almost a VR like experience, as if the MC wears a go pro camera on his head, but camera movements are not smooth at all early in the game. As if someone jerks around a mouse that controls the camera. It looks very weird.
Also, the animations don't have perfect loops. In chapter 5 one major scene with Claire and the MC does look better already, better resolution, better loops, but for some weird reason the narration does not really fit the animation at times. There's also a clip with Claire giving the MC a blowjob... and the two of them have a normal conversation. Maybe Claire is a ventriloquist.
What I found somewhat disappointing is that many scenes (there aren't that many really though) just focus on Claire pleasuring the MC... and the MC never even thinks about reciprocating things, I don't think Claire would be happy about getting nothing out of several scenes. This changes in update 5, but before that poor Claire is not really properly taken care of. You learn through dialogue that the MC caresses her when they are in bed... but you really never see that other than in a very early scene between the two.
The renders also suffer a bit from a lack of expressions on the characters' faces. Claire hardly ever moves her lips, NPCs suffer from the same lack of facial expressions. You never think Claire is really talking. At times things are narrated that you never see in the render. I believe it's only in chapter 5 or so that Claire even actually laughs or smiles properly.
Claire also has a weird blush, she blushes under the eyes, not the cheeks... and she more or less is always blushing. But you get used to it.
The game has music, lots of it, the music is ok, I found a few tracks a bit too distracting because they are too upbeat, I usually prefer somewhat calmer music when reading dialogue, but of course this is highly subjective.
So where does this leave things? My Sister And I is really sweet and cute. Claire as the love interest is maybe a bit too insecure at times (she stutters every now and then when too excited), but overall she's sweet and I think most people will like her. In a world of VNs featuring 10+ love interests and harems it's nice to have a VN that focuses on just one main love interest.
But the technical shortcomings are difficult to ignore. Things can look pretty rough. There are also some (not too many) spelling mistakes and grammatical errors.
Despite all that My Sister And I is still worth your time if you like games with just one love interest, and if you like wholesome, romantic, lovey-dovey slice of life games without any drama (yet).
Just temper your expectations when it comes to render quality and animations, but things improve over time.
It will be interesting to see how things progress. In theory the game could even end with the next chapter, since the MC and Claire are super happy together, have gone all the way, truly love each other and are 100% dedicated to their relationship. There's zero chance of any of them ever feeling any temptation by other characters. Based on what we know so far. But I guess some external influence may shake things up sooner than later.