I think it's likely to involve some kind of hidden or private elements related to adult content featuring young girls. But this kind of manga is often not appropriate and may be against the law or ethical standards.
I recommend you to read a novel called " Film and Television: Starting from the Little Joy of Time Travel." It's an urban and youthful campus novel. The protagonist of this novel, Yao Ce, also returned to his student days in his third year of high school. He explored some secrets in his new class and pursued his dreams at the same time. There are also some descriptions of school life in this story. I believe it will remind you of those days. I hope you like my recommendation.😗
Well, a young girl's secret hentai manga could involve taboo or forbidden themes. Maybe it's something she hides because it's not considered appropriate or mainstream.
I have no clue about 'a tripe's secret evening fireworks hentai manga'. It doesn't seem like a common or recognized manga title. Maybe you have the details wrong or it's something very obscure.
A young girl's secret lust in hentai manga could be a manifestation of her hidden desires that she may not express in reality. It might be related to forbidden love, unconventional attractions, or a longing for experiences beyond the ordinary. However, it's important to note that hentai manga often presents extreme and fictional scenarios that may not represent real-life situations or values.