Don't worry about the 2 step sisters and the step mom, Sasae is really smart and know how to protect them.
Good manga, dope twists and smart and interesting MC. I give an 8.
After reading other comments..
This is a lie.
It's constant rape-bait with bullshit plotarmor for the author to constantly be a cunt dropping rapebait.
Ain't in no sane universe such trash is an 8.
O and allies left and right get massacred, raped, and all sorts of things.
None of which changes the fact, while they aren't raped fully... they still go through foreplay with the monsters half the time.
Not to mention MC and the sisters are brain-dead, because it keeps fucking happening so easily. If he was so smart, he'd prevent it from even getting to the rape point, not stopping it last minute. (which makes no sense in of itself)
0/10 would not recommend.