Eyyo, just found this manga recently, yes it's very brutal,
especially in chapter 6, the beginning of the hell.
It made me angry, really angry toward Keita and his friends, my blood rushing into my head every chapter I read. Their abomination knows no limit.
They rape the girl just like that, one of them even said in chapter 7 : "besides...I heard rape feels really good to women", "and even if we do get put on trial, there's no way she's gonna be able to say she got stuffed full of cock in front of all those people, right!"
you know what? he even said that with his annoying smiling face, made me want to punch him really good.
So far in here chapter 14,
two of them already got their deserved death, the dad torture them before killing them made it really satisfying,
but IDK for the last target : Keita. It's 10 more chapters, will the dad manage to kill Keita really good? This is old manga, yet online scanslation still in chapter 14 (18 March 2023).