The Shiunji Family Children - Vol. 1 Ch. 4 - The Speculation of The Second Daughter

[MangaDex]

 

[GoufTroop]

Damn, is there a single likeable character in this series?

 

[LordoftheKeep]

Damn, is there a single likeable character in this series?

from the creator of Rent-A-Girlfriend...
so no

 

[tonie]

So legally speaking it is possible? Interesting.
No, I don't have adopted siblings nor I thought about doing that.
I've been just wondering how the hell did Japanese mangakas got this idea from.

 

[same_as_usual]

I hate the fact that he looks like that dork from rent a girlfriend

 

[ilikewholesomemanga]

I hate the fact that he looks like that dork from rent a girlfriend

Art style

 

[GlyphXion]

They should legalise incest I think

 

[silverpetricof]

I wonder how logical Seiha would be the moment I embrace her and squeeze her bubbly boobs with no avenue of escape.

 

[KaiserFrazer67]

You would think that Seiha, being the little bookworm dweeb that she is, would've at some point ran across the hypothesis called the "Westermarck Effect" (a.k.a. reverse sexual imprinting) somewhere in all of her research. It's the psychological hypothesis that states that people tend not to be attracted to peers with whom they lived like siblings before the age of six. Plainly speaking: In this sort of setting, having been raised together since childhood, the idea of ANY sexual attraction between Arata and any of the girls--blood relative or not--should ipso facto be VERY off-putting to any of the parties involved.

 

[KaiserFrazer67]

So legally speaking it is possible? Interesting.
No, I don't have adopted siblings nor I thought about doing that.
I've been just wondering how the hell did Japanese mangakas got this idea from.

Japanese mangaka seem to have, more often than not, a fetish for "almost-but-not-quite-incest" situations in general. I've seen it in Korean manhwa too, so it's not totally Japanese.