Supercell (スーパーセル) is a doujin group which has produced various hit songs and related art, focusing on the Vocaloid Hatsune Miku. Because ryo used 119's illustration in a video of "Melt" without 119's permission and did an ex post facto report, the interchange of ryo and 119 began after Supercell was formed. On May 10, 2011 the hit single "World is Mine", was presented on US Amazon. As of June 21, 2011, Supercell's 1st album may be bought on iTunes. Later on, the group had partially retired from doing Vocaloid works and have moved on to doing more professional music.