Believable look at the interactions and bonds between a naive, virginal young man and his enigmatic female classmate (adult school for "ronins" = college exam washouts), the seemingly plain, reserved, and serious star pupil... whose second, secret persona is that of a strikingly beautiful, neurotic, deeply traumatized, self-destructive, and utterly lonely prostitute - a seemingly emotionless perfect slut mask beginning to show deep cracks spreading down to the very core.
The protagonist's accidental discovery of her occupation and the gradual discovery of the tortured soul and true personality beneath the two masks sets up the premise for the story.
The reader sees and knows more than the boy, but neither gets a clear picture. She seems less than willing at times, likely coerced or cornered into the situation, maybe even outright forced into sexual slavery, but there is much mystery surrounding the circumstances of her present and her past.
Very skillful, subtle depictions of dehumanization and trauma. LOTS OF IT. And just the way it tends to look in reality, no less.
The author takes us on a roller coaster ride of conflicting emotions - through pity, disgust, extreme arousal despite, sympathy, hatred, infatuation, confusion, and back again - a couple steps ahead of our rather daft and naive protagonists, but closely following his own.
WARNING: BEYOND GRAPHIC. hardcore sex, physical abuse and emotional anguish scenes abound, and, worse yet, are skillfully built to evoke strong emotional reactions mirroring the protagonist's towards the tragic heroine. The effect? Front seat, first person view, 3D FullHD-grade impact. Which also means that, unlike shallow cartoonish fantasies about technically far more twisted stuff, this one packs A LOT more punch... this one's graphic not just because of the acts shown or even the realistic artstyle and low degree censorship, but because it's believable and emotionally fleshed out. And the author is in complete control of your reaction and will decide for you when you'll be aroused, and when you'll be disgusted by just having been aroused, and when a sudden burst of sympathy or gentle cuteness will overwhelm even those powerful, lingering emotions.
PS if you're thinking something to the lines of "no worries about this one - just read a hentai where a guy has to watch his mom or girlfriend get raped by a school class or a baseball team - and didn't even bat an eyelash there"... YOU'RE LIKELY IN FOR A SHOCK. This one aims to traumatize. And, through extremely realistic settings, believable characters, and no-nonsense emotional attachments to them skillfully woven by the author, it does so far more successfully than any over-the-top megatwisted zoophiliac cannibalistic loli-ero-guro - or whatever you yesterday thought was the disturbing stuff in the H genre.