R15+ ja Dame desu ka?

What should I do to become an adult? Akane Amou, who grew up with her parents forbidding any kind of entertainment, is a little bad with "stimulating" stuff, to the point she can't even watch a kissing scene in a drama. Now that she's a highschool student, she somehow wants to overcome it! Those are her intentions, but it's not that easy. Meanwhile, she got acquainted with a movie otaku named Fuyumine. Will she be able to watch an R15 movie...?