iroha(sasaki) was not a popular Vocaloid producer until he created the explosive hit song "Roshin Yuukai," which is 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". His song "Moon" also became a hit, but it took over half a year to reach 100,000 view counts. He's known for his drum-and-bass and Miku-trance sounds.
Works (Upload date) ; (YouTube Playlist/ Nico Nico Douga List)
- "moon (Short ver.)"(Sep.27.2007)
- "moon (Full ver.)" (Miku) (Oct.29.2007)
- "Ringo" (Miku) (Jan.24.2008)
- "Saika" (Miku) (Feb.07.2008)
- "aquarium Remix" (Miku) (Jul.21.2008)
- "carol (Full cover)" (Miku) (Aug.06.2008)
- "moon PVedit. (rev.2)"(Sep.09.2008)
- "Roshin Yuukai"(Meltdown)(Previous ver.) (Rin) (Dec.20.2008) (Deleted)
- "Roshin Yuukai"(Meltdown)(Revision) (Aug.30.2009)
- "NOAH"(non-Vocaloid song) (Sep.25.2009)
- "noctiluca"(non-Vocaloid song) (Sep.25.2009)