The World's Greatest First Love: The Case of Ritsu Onodera is a Japanese BL 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. 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.

Junjo Romantica: Pure Romance is a Japanese boys love manga series by Shungiku Nakamura. It focuses on four storylines: the main couple, which comprises the bulk of the books, and three other male couples that provide ongoing side stories. It has expanded into several CD-dramas, a manga series running in Asuka Ciel, a light novel series titled "Junai Romantica" running in The Ruby magazine, and a 37-episode anime series.