Fifteen is a Japanese coming-of-age drama series centered on the lives of high school students and the emotional pressures they face as they approach adulthood. It explores friendship, identity, romance, and the uncertainty of youth through a realistic, character-driven story. The title is often associated with the original Japanese work rather than a heavily variant-branded franchise, so the main master title is best kept simple. If you are matching across databases, this is the most common non-variant form to use.