Even foregoing the age of consent argument, the woman took advantage of a confused young person then dumped her like yesterday's garbage. where is the justification for that behavior? Those of you who are only arguing that Jinno was old enough to have sex, seem to imply its Jinno's fault she was mistreated. Typical blame the victim mentality. I am a long time yuri fan and have even been known to like the occasional age gap story, BUT only if its dealt with responsibly, such as Dear My Teacher, where the student and high school nurse agree to wait until high school graduation for the student to confess.
Just because a certain country or State has an age limit for sex, that is not the only factor people should look at when considering whether to have sexual relations with a minor. And many U.S. state laws can consider sex with someone under 18, but at the age of consent, rape "if the consent is received by the child by deemed seduction or deceit." And if anyone dares argue that it was a "spur of the moment, lustful occurance" should recall that this is exactly what many rapist claim.
I am not necessarily for censorship, but readers should be responsible in what they allow children to read and there is an age of which this type of scenario should never be written of.