The song was first uploaded on April 28, 2008 and is Hikutsu-P's sixth original work. It's Hikutsu-P's first work to feature Kagamine Rin, and second to feature Kagamine Len, the first being "Mou iyada!". "Wadachi" tells a story of two who talked about life. May it be happiness and sadness Len had always been there for Rin, and vice versa. Overall it tells a story of not giving up, so long as they have each other.