"Benzene" was first uploaded on November 8, 2008. It is Owata-P's first original work using Kagamine Len, and is also the first track to his Benzene＼(^o^)／ Series. It's also featured in Owata-P's album "Tsumanne \(^o^)/", and to date has over 300,000 views, making it the current third popular song of the series. Owata-P said in his description that the song is mainly "an instrumental song", for the "lyrics" comes in at 1:30 of the song. Two years later he uploaded an "RX Benzene", an arrangement sung by the utaite Ritsuka. Two years after RX Benzene, following the Benzene Series' pattern, Owata-P uploaded another version of RX Benzene, sung by Haku Yowane and Akita Neru.