I read the light novel(volume 5 or 6 i think) and this manga some time ago twice. So I'll make use of what I remember and be concise about it. Also, the anime adaptation has recently been announced.

This is a nice breath of fresh air after the Yokohama arc(the previous arc). We now get to see how this borderline incestuous dynamic between brother and sister came about. I was expecting some incelly take on how someone can conquer their sister if they just put their mind into it, but what I got was a heartwarming and cute story about a girl who learned how to appreciate her brother's presence more.

Art 7/10

I don't remember much, except the the art being decent. I'd say it's better than the generic art form coming from a lot of romcom mangas but it's not on the levels of Murata or Kentaro Miura. Because this arc takes place in the tropical parts of Japan, and as someone that likes beaches, the landscape and background art are indeed aesthetic to a tee.

Story 6/10

I've read the light novel before the manga, so I had 3 takes to review my point on the story. Nonetheless, my opinion has never changed at all. The story is fine. We are taken into the perspective of Miyuki and how she developed her current brocon status towards Tatsuya sama and the storyline is as straightforward as it gets. Because of that, we see a more dimensional Miyuki when we see her again in the next arc. Nothing to comment for Tatsuya sama. As much as I hate to say this, he's still the same aloof bae we simp for.

What you see in the manga form is a faithful adaptation from the light novel. There were some nitpicks I can point out, but they're irrelevant to the big picture, which is the plot.

Characters 5/10

Apart from Miyuki's very cute character development which is an 8, the majority of characters are a definite Meh. Not much to say about them. Because I'm mostly treating this manga as an adaptation than a standalone work, I'd say it accurately depicts what's in the light novel. Don't get me wrong, I enjoyed the novel and the adaptation. But upon evaluating my thoughts(and watching a lot of anime and manga), I'd say they're pretty average.

Enjoyment 8/10
I personally enjoyed this adaptation and there's honestly not much to say

As someone who has read the novel prior to the release of this manga, this is a good adaptation and you should read it if you're too lazy to read the light novel.