The best ending would be that shion goes trans and then he's the female lead.
I was wrong. In the anime ep5, the voice was a mix of all the girls. So it seems like he married one of them.I guess it's the future with his wife of his choice [not one of his sisters or his brother]
"Where are you guys? What have you guys been up to?" Maybe it indicates that he didn't see them in a while, so his wife being one of the sisters will be a low possibility. But what is more interesting is that he called that child [possibly his daughter] "Chihiro" which is his mom's name. He said he loves all of them too, so that tells that he didn't marry anyone of them too.
I don't think so. The dad said ,That he was right choosing him, after Arata said that he's protecting his siblings and making everyone smile.Arata was chosen to be her "soulmate"
not completely sure, because both the father and the mother have black hair. so it might be right and it's just some genes thing [both the parents have some genes that gives the another color and she inherited those genes] or she might be adopted like the father said.Banri is not actually adopted
I guess it's true but the siblings said in some chapters [don't remember which] "She is probably teasing him and going on dates with him" referring to Banri. So it's probably much time before the announcement of their adoption. Also that is why he was kind of normal with her saying "let's go on a date" [referring to chapter 6].insistent on taking him out on dates and flirting with him.
This, so much this. If the author isn't going for one of those then they're better off just writing vanilla. imo...oh no, no no no no. Don't you dare go "5-touboun no Hanayome" route. I wish every "harem" manga would go for either the Golden route which is the true harem ending, or "Bokuben" route where every single heroine got their own ending routes.