Junjo Romantica ~Pure Romance~ (純情ロマンチカ, Junjō Romanchika?, lit. "Pure Hearted Romantica") is a yaoi series by Shungiku Nakamura. It focuses on not only a main couple but three other male couples. It has expanded into several cd-dramas, a manga series with a spin-off running in Asuka CIEL, a light novel series running in The Ruby with a spin-off and a 24-episode anime series.

Source: Wikipedia