Umm....statutory?
So, in the Manga, Kurono mentions at least once in the earlier sections of it that he is 15. I'm pretty sure in the anime that he mentions being in 10th grade.
Within days(no more than a few weeks) of these moments he encounters Sei Sakuraoka.
She seems definitely older than him. She is very tall, and doesn't talk or act like a teenager at all. She refers to herself as his "big sister" in the original Japanese audio, and in the English dub later mentions "the age thing" when proposing that they date.
At an ABSOLUTE minimum she's 18, but seems more in the 25-35 age range, to be honest, and she has sex with a 15 year old...
That pretty much makes her a straight up Pedo.
"Today we are cancelling the apocalypse!"
Pacific Rim
July 12th, 2013