Sekai-Ichi Hatsukoi: Onodera Ritsu no Baai (世界一初恋 〜小野寺律の場合〜?, lit. "The World's Greatest First Love: Onodera Ritsu's Affair") is a Japanese boys-love manga series written and illustrated by Shungiku Nakamura, the illustrator and author of Junjou Romantica. There are currently 8 volumes, but it is ongoing. The first volume was published in 2008 in Asuka Ciel. In 2011, the manga was adapted into an anime television series under the title Sekai-ichi Hatsukoi. Produced by Studio Deen under the direction of Chiaki Kon, the anime series began its broadcast run on April 9, 2011. An original animation DVD was bundled with the fifth and sixth volumes of the manga series, released in March and September 2011. A film adaptation was released on March 15, 2014.