15-nenme (15年目, lit. "The 15th Year") is one of Ai Yazawa's earliest known works, and was serialized in Ribon. It was published by Shueisha on July 15, 1986. It has never been translated into English, and is most likely out of print in Japan considering the age of it.
It can be described as a "typical" love story that was popular in the 1980's. The story can be conjectured through the pages that the story might be a love triangle between two guys and a girl.
15-nenme consists of one volume with atleast two chapters. Ribon serialized it, and Shueisha published it in 1986. Yazawa's debut short story, "Ano Natsu" was also included with 15-nenme publication. A few pages of it can be found, when scouring through the internet.