The novel is a detailed account of a depraved orgy involving disgusting
perversions and sickening sexual violence. It's a neat bit of foreshadow-
ing, for it turns out Mitsuki and Hidaka have a serious sadomasochistic
relationship, and they're probably using the book for inspiration.
Page 24 - consider Hidaka-kun's classmates getting together to murderize him (plain 'murder' is not enough) for apparently and inexplicably having captured Mitsuki, as barely sufficient recompense for *a-hem* "deflowering" her with his fist ("..... BUT IT'S WRONG!"). Perhaps it was to be expected as he was rather quick to accept rumors about her than to grasp that she had indeed fallen for him, until she said it plainly to his face.
Aside from the "Fist Of Defloration" moment, I say: "APPROVED!"