I dont have much tolerance to SM stuff and I almost none to NTR or r+pe stuff, so I had an unpleasant feeling reading this for almost the 40 chapters.
Ngl, the only reason that gave me the strength to keep reading, was my need to clarify all those "enigmas" with the sister and her friends, the author creates plenty of situations to build up some kind of a "dark" and mysterious situation in the background that are teased with vague answers, so that left me with that sensation of unease all the time.
I was looking for a story with taboo relationship with some sugar and some punches to the hearth, but instead, what I found here was some uncomfortable SM stuff and a totally disgusting r+ape. At least the psychological stuff that justifies the behavior of Miyu its somewhat tranquilizing, had the fear of that was gonna be something really really disturbing, but im glad that it wasnt.
Still, feels like the "romance" things are just starting, and with that cancerous friend that Miyu has, I have the feeling of more weird and unpleasant stuff it gonna happen.
What im really missing on this story its a POV from the sister (Miyu) side, would have been really good for the trip arc Anyways, not a bad story, I would say it like a "meh" at the least, b/c for me, some of the resolutions of the enigmas felted quite "meh".

I don't know, this story doesn't convince me, throughout the chapters that have been translated to date, I can easily intuit that the sister is involved in something shady, and probably something of s*xual indolence. The mere idea of thinking about it and it sounding terribly logical makes me nauseous, I know it's a novel, but my stomach is not prepared for something like this.

Pd: You're not going to find anything related to brother/sister love in this, just save yourself the trouble and move on to another story. I repeat,... more>> it seems that the sister is in something terribly dark, and you don't want to go in there. <<less