Nanaka 6/17 (ななか6/17, Nanaka Jūnana-bun no Roku?) is a 13-tankoubon manga and 13-episode anime series created by Ken Yagami.

The manga was published by Akita Shoten, while the anime was aired on TV Tokyo. The series is licensed for distribution in the United States by ADV Films. The manga was initially licensed by Studio Ironcat, but all plans on release were dropped with the company's fall.

Source: Wikipedia