If he were actually sane I feel like he'd actually tell them all to back off while he sorts his shit out without them coming onto him like this one after the other.
Maybe that's just me - but whatever he tries to do his "precious family" is going to fall apart. He picks one, the rest get mad and leave. He picks none of them, the whole family falls apart. He picks all of them, this becomes dumb wish-fulfillment slop nonsense that becomes somehow more unrealistic than it already is. (Because of course five quite-different girls would all just so happen to fall for their same adopted brother and not.....any of the other boys in their respective lives. C'mon, now.)
He won't do anything but pull that same Kazuya-adjacent expression though while grunting weird surprise-noises and getting flustered while the Five increasingly go on the offensive to one-up each other, though, so I guess I'm not really expecting anything spectacular even from this.
Not like I'm not gonna be here for chapter 62 though, so.