It's rather unbelievable how the series tries to make us sympathize with 2 persons that at first glance seem beyond help.
For starters, the girl became a teen prostitute because she disliked herself (yep some variably emo reason like most b****** would say).
Then we have the boy, who despite being a typical good-for-nothing, is far more perverted than what the most open-minded person could be comfortable with, he treats every girl as a sexual object, would have sex with her without concern for her future, and brag about it. And like a typical adolescent "in love", he's also proved to be childishly possessive and persistent. As if that was not bad enough, almost every man, old and young, in this series is also as demented. The girls are just sexual objects, the relationships superficial and all talk, the reasons for their unseemly behaviours weak and mostly an afterthought. None of that chivalry or 'pervert with a heart of gold' stuff here, none of what would help you look at the perverts in a more sympathetic light.
Or at least it seems so. Truthfully it's hard to get over the initial bad vibes this series gives off. Even I still have hard time deciding whether this is another pointless borderline-hentai series, or it's actually trying to have us rooting for the seemingly amoral and unashamed characters in a very unorthodox way. Which and how, you'll have to find out yourself, and yes the characters get a bit nicer later on, and the couple is quite popular.