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Not really close at all.

Spoiler I think...

For the nsfw question there isn't really any. for Koya's route on the beach trip you see him naked also when you go with Tora for swimming you see a naked and cute otter.

Usually, in Visual Novels that focuses a little more on the story, you have more of a tease during the story and only gets nsfw at the end. That's the way normal VN's do. But some are kinda putting the NSFW in the entire VN. But since this is Morenatsu, they will probably add the NSFW at the end only.