Please, please, let this manga be mature. No, I don't mean explicit sex scenes or gory shit, but just don't give anymore of that infantile prepubescent shit of being coy and whiny, topped off with huge dollops of immaturity and insecurity. Humanity has become the apex species of this planet because we fucking love to bone and because we can be bloody resolute, damnit!
I just want characters that are realistic. MC is a cold-blooded killer? Fine. Have him kill. Make him cold. Make him calculative. But if he doesn't kill, make sure his reasoning is sound. Same with "pure" characters. Backup their characteristics with reasoning, damnit! Show their thoughts in their acts!
Sorry for ranting here. I'm just so hyped to see something that seems so promising with this manga, that I'm really worried that the author would just fall back onto dumb manga tropes just because "it's expected".
If this manga has ABSOLUTELY NO tsundere bitch characters, I will name my next child according to the MC's initials. Well, I've already had all the kids I intend to have, and I'm bloody forgetful, but if I remember, watch out! Fucking tsunderes.