I think the thing that bother's me most about Inei is not that he is edgy, but more so how he acts in the new environment. If I was contacted by my potential family and wanted to learn more, I would not try to alienate them but bring them into my trust to use them.
I think in terms of Inei, as Luna and Ren both remarked about him, he has severe trust issues.
And being with his master for so long probably a lot of his master's traits rubbed off on him becoming a huge influence.
I see his trust issue to be edged sword really.
On one hand, being on guard all the time and alienating a potential family shuts down the risk of exposing himself to people that are basically strangers to him (and possibly being played/tricked if it ever is), but on the other hand it also presents a problem as you said if he opens up there's possibility for more information/resources he might be able to obtain that he just won't get by shutting them out.
I like both sisters, so I do hope both are LIs.
Luna's my favorite girl but I quite like both Akira and Mirai as well.
Hope they don't get locked out if the player (like me) chooses Inei path, but I guess we'll find out later.
Generally, forcing a player to pick girls in a harem game does not go down well if not made clear from the beginning. Will be interesting to see how it works as some of the girls hate each other (twins and the blond girl for example).
MC tried to play the mediator by asking Luna "Can't you forgive them?" which Luna flat out said "No" so I am wondering if MC will try direct face to face mediation of Luna and the twins (of course, this could turn out to be a disaster and the whole meeting place could turn out to be a warzone. First it was the drone......next?

)