Under17 was a popular Japanese duo that wrote and performed many songs that are featured in anime and video games. The lead singer, Momoi Haruko, is well known for her unique vocals and catchy lyrics. This group has released several adult videogames' opening songs. On September 27, 2004, it was announced that Under17 would break up, with Momoi Haruko and Koike Masaya going separate ways due to creative differences.
The band reunited for one song on August 31, 2008 during the Animelo Summer Live.
|Oku-sama wa Miko?||2001-04-27||Vocals||Under17||Theme song "Kyouryuu Shoujo"|
|Ichigo-Da||2001-09-14||Vocals||Under17||OP "Ichigo GO! GO!"|
|Sweet Legacy||2002-04-26||Vocals||Under17||PS2/PC remake insert song "Okashi na Onna no Ko"|
|Milkyway 2||2002-06-28||Vocals||Under17||OP "Koi no Milkyway"|
|Majo no Ocha Kai||2002-09-27||Vocals||Under17||Ponica ED "BITE", DC only Akiyo ED "Extensions"|
|Popotan||2002-12-13||Vocals||Under17||OP "Itchae! Popotan", ED "Kotae"|
|Teriru no Christmas BOX||2002-12-26||Vocals||Under17||Main theme "Which do you choose?"|
|Magical Twirler Angel Rabbie||2003-03-21||Vocals||Under17||OP "Tenbatsu! Angel Rabbie" and ED "Angelic Magic"|
|Shinobitic☆Heart||2003-05-30||Vocals||Under17||OP "Samishikunai Mon"|
|Tsurupeta||2003-06-27||Vocals||Under17||OP "Tsurupeta-san Irassha~i!"|
|Sukumizu ~Fetish☆ ni Narumon!~||2003-07-25||Vocals||Under17||OP "Tsurupito na Koi", ED "Natsu da! Umi da! Sukumizu da!", Insert song "Oyo-ge-na-i"|
|Majokko a la Mode||2003-08-29||Vocals||Under17||OP "Hide and seek", ED "Adolescence"|
|Fake||2003-09-12||Vocals||Under17||OP2 "Atarashii Yoake", ED "Destiny ~Unmei no Koi~"|
|Milkyway 2.5||2004-06-30||Vocals||Under17||OP "OS NO/YES"|