Rainy Baby is an original work and the first work of shiNOder. It is a techno-pop song featuring KAITO V3. According to author's comment, it is a song of rain and a broken heart. An english version of the song was published half a year after the original. For this version, shiNOder created the lyrics using Google translation. There are parts that express slightly different expressions from the Japanese version, but both versions are made to be almost the same by meaning.