Riya (born February 18) is a female Japanese singer^[1] from Fukuoka, Japan. In her early career, she admired Akino Arai. Riya eventually became the lead singer and lyricist to the J-pop band Eufonius, which debuted in 2003.

• "Toki no Mukōgawa", Released March 24, 2005 by Lantis

• Sorarado, Released on December 28, 2003
• Sorarado Append, Released on December 28, 2004
• Love Song, Released August 31, 2005 by Key Sounds Label

• "Mawaru Sekai de" (duet with Haruka Shimotsuki; opening theme to PlayStation 2 game Akai Ito)
• "Tabiji no Hate" (duet with Haruka Shimotsuki; ending theme to Akai Ito)
• "Dianoia" (opening theme to PC game Saishū Shiken Kujira)
• "Crescent Moon" (opening theme to Dreamcast & PlayStation 2 game Suigetsu ~mayoigokoro~)
• "Mag Mell" (opening theme to Clannad)
• "-Kage Futatsu-" ("-Two Shadows-")/ "Chiisana Tenohira" (ending theme to Clannad)
• "Hikari no Hō e ~Ashita e no Jumon~ (opening theme to PlayStation 2 game Mabino x Style)
• "Narcissus" (opening theme to Narcissu: Side 2nd)
• "Apocrypha" (opening theme to Shinkyoku Sōkai Polyphonica)
• "Reflectia" (opening theme to True Tears and, in a modified version, as an insert song for Tari Tari)
• "Hiyoku no Hane" (opening theme to Yosuga no Sora)

• Riya's profile at Eufonius' official website (in Japanese)