How our inhumanly strong protagonist hasn't yet grabbed his insufferable (blood- not adoptive-)father by the neck and shaken him until plot falls out is beyond me. Everyone is in this insane, experimental eugenics incest dodecahedron of arranged relationships for literally no reason, and just going along with it. Also how do you maybe or maybe not have a brother and don't demand clarity? Just fucking imagine your actual parent teasing you with a potential sibling you can kind of remember, but not revealing anything more until you've navigated their Takeshi's Castle-esque maze of riddles and conundrums.
"Welp, nothing we can do, better just continue in these insanely awkward, contrived, and manipulative living conditions for ecchi hijinks until we're allowed to do... something?" What even is the end goal at this point? Who's supposed to marry whom and why? It's crazy how much this fucking manga coasts on imaginary plot. There's the tease of plot just around the corner every chapter, but actually it has no plot that just plods along by virtue of no single character acting remotely like a human being.