iroha(sasaki) is a VOCALOID producer who debuted in September 2007 and is well known for the hit song "Roshin Yuukai", famous for appearing in the top 3 on the Weekly VOCALOID Rankings for six consecutive weeks. After Roshin Yuukai became a hit, he was given a producer name: Itsuu-P (胃痛P) (meaning "stomach ache"), because a large amount of remarks on the video said "My stomach hurts". He collaborates with many other producer for both his and other peoples' works. He works with the lyricist n under the name "シリカ" or "Silica". Read more on Last.fm