this manga's moral world is so tiring. she's the rotten one for leaving home to be a whore, not the men who just accepted what she offered. end of
There is a reason most civilized countries don't allow teenagers to make legally binding contracts, drive a car, or drink - it's because they're dumb and lack perspective. Taking advantage of that makes you an inconsiderate asshole, at best, and a predator at worst. Someone offering you something doesn't mean you are under any obligation to take it.
If we really wanted to assign some sort of blame, we would have to start her family who caused her to take such drastic actions to begin with. Another part of it lies with her, and yet another with any asshole who took advantage - because these people are just as much (or more, if they were adults) responsible for their actions as she is for hers.
Like I get the story beats you over the head with it's morals/drama, but being a pedo is bad regardless. There is no justification for that shit.