- Takumi (2001-2007)
savage genius was formed in 2001 by Aa and Takumi. They won AXIA Artist Audition 01 AXIA Shou in 2001 and signed with Warner Music Japan. In February 2002, the band debuted with the single Orange but after two singles with Warner Music, savage genius transfered to Victor Entertainment's sub-label flying DOG. They released Omoi wo Kanadete, their first single with flying DOG in October 2004. On the November 30th, 2007, Takumi announced his retirement from savage genius, leaving Aa the only member of the group. Since then, Aa is collaborating with other artists for composing works.
- [2006.07.05] Kaze no Kesshou (風の結晶; Crystals of Wind)
- [2007.11.07] Sora no Kotoba (空ノ言葉; Language of the Sky)
- [2010.10.20] First Smile (best album)
- [2002.02.27] Orange (オレンジ)
- [2002.06.12] Koigokoro (恋心; A Heart in Love)
- [2004.10.21] Omoi wo Kanadete (想いを奏でて; Playing on My Feelings)
- [2005.05.11] Forever...
- [2005.07.06] Take a chance.
- [2006.04.19] Inori no Uta (祈りの詩; Song of Prayer)
- [2006.12.20] Aizome ~ Futakomori (あいぞめ～二籠; Indigo Dye ~ Two Prisoners)
- [2007.05.16] Hikari no Yukue (光の行方; Light's Whereabouts)
- [2008.16.10] JUST TUNE
- [2009.06.03] Maze feat. Ohmi Tomoe
- [2009.08.19] Watashi wo Mitsukete. (私をみつけて。; Find Me.)