Sekai'ichi Hatsukoi: Onodera Ritsu no Ba'ai (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, and spin-off of Junjou Romantica, written and illustrated by Shungiku Nakamura. 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.
Plot- Onodera Ritsu, a literary editor, resigns from his father's publishing company, due to his coworkers' jealousy of his success, claiming that he is simply riding his father's business. He applies for a position at Marukawa Publishing, but instead of his preferred department of literature he is placed in the infamous shojo manga department, Emerald. He initially considers resigning, especially because he finds his new boss, Masamune Takano, intolerable and unnerving from the very beginning; however, Takano inadvertently convinces Onodera to stick with the job by calling him "useless," his pride forcing him to stay in order to prove his worth. Later, Onodera learns that Takano's old family name was Saga, an older schoolmate from high school that Ritsu fell in love with and confessed to.