Aight first of all, I drop all mangas that have genre "harem" and exactly, most of the manga that have genre "harem" do have so good plot, not gonna lie i don't wanna get this a harem, and there's a possibility that there will be a person that will announce a marriage to MC, did you just forgot that in this manga, his in the other world? Means they don't have much intelligence, and there's a manga that would even marry a sibling to sibling y'know? And we know that this is a very light hearted, soft and warm isekai it's just as it is it's like a "slice of life" genre?? Sure, and do you wanted to get betrayed? All can have familiars but it really is for him, will he give it to other? Yes? Apperently, yes he will if those siblings will want to, and ofc they already ask, most of all, it's like you're saying that it's ok to have harem.
Angelic? Lmao they doesn't even look cute.
Y'all got triggered so much lol.
Doesn't want them to get romance? Please his age is still in a single digit, it's still far of in the future. Man. You guys read too much harem isekai ╮(￣▽￣)╭
The sister and the others are too clingy and annoying? Sure. Everyone here must've been a very angelic, well-behaved, gentle 5-year-old with no tantrum on your record.
Everyone can get their own familiars? Well, can demihumans even get familiars? Even if yes, as for currently, MC is the only one with magic, yeah? How can they get familiars with no magic? Are we even reading the same thing? They just claim the "rights" to take care of the familiars, man. It's not like MC is gonna refuse extra help. He's like 5. Literally.
Imo, this is a very light-hearted, soft and warm isekai. We just need to see how they're trying to live their life. That's it. Just live in the present, peeps. No need to worry yourself about a possible future plot that may or may not just be your own delusion.