ABSOLUTE CASTAWAY is a doujin group formed since 2002. Most of their releases are sold during the Comiket. The group is lead by 中恵光城 (Mitsuki Nakae) or simply みつき (Mitsuki). ABSOLUTE CASTAWAY's first 4 albums were voice dramas. However, on the release of their fifth album, 季ノ唄 (Ki no Uta, Song of Seasons), their songs became "Japanese themed", with influences from Japanese tradicional songs.