The World's Greatest First LoveThe World's Greatest First Love.

The World's Greatest First Love: The Case of Ritsu Onodera (Japanese: 世界一初恋 〜小野寺律の場合〜, Hepburn: Sekai-Ichi Hatsukoi: Onodera Ritsu no Baai; also alternatively known as Sekai Ichi Hatsukoi: The World's Greatest First Love in the English anime) is a Japanese manga series written and illustrated by Shungiku Nakamura. In 2011, the manga was adapted into an anime television series. Produced by Studio Deen under the direction of Chiaki Kon, the anime series began its broadcast run on April 9, 2011.