15-sai · review
I don't think this is a good pick for most people; it is interesting, but also pretty fucked up. The title is actually kind of misleading, because for most of the story, the main character is actually 14 years old. From that, you can probably guess why a strong majority of the many sex scenes are really uncomfortable (also the NTR). The main thing I like about this story is that discusses a characters shame around their sexuality, which is a very unique theme that I find really interesting. There are parts that I think do a good job of handling it, buttheirs also some hypocritical slut-shaming that is the main reason I don't rate this higher.
If any of the above is your thing, you'll probably like this, but if you aren't explicitly interested in (or at least fine with) the sex scenes, this would be hard to recommend.