Yah... this feels kinda forced... something just doesn't feel natural about how the author is bringing imouto into all this... like, I get you need 3 to make it a harem.... but... love triangle would have been fine... not everything needs to be a harem.
There has to be something missing from all this. Why would the dad push for Sachi like that? Maybe he wants the older brother to be with Erika? Maybe the parents knowingly switched them at birth?
I'm confused. If the dad says that Erika's brother doesn't exist, then how does she have memories of him? Either this is poor writing on the author's part, or they're trying to pull some 200IQ play on us. Either way, it's pretty annoying
What kind of incestuous bloodline dodecahedron configuration is this headed towards? Also, wow that father is an enormous piece of shit, who plays with their children like that?
It's also still fucking weird how Sachi keeps getting framed as a love interest. Also weird how thirsty she is for Nagi. I know they're probably not blood related but they still grew up as siblings and it's abundantly clear that Nagi does not consider her as a romantic partner.