- Name: Kosaka Riyu
- Favorite Artists: Brittany Spears, BOA, Perfume
- Favorite Movies: Lord of the Rings, My Brother Sam is dead, Pearl Harbor
Her first solo song True... was released. True... was very successful in the Konami community. Riyu then went on released more soundtracks featured in Konami games.
Her first album was released in 2004. It is titled Begin and it has a collection of cover songs of other konami game songs. The album also includes 3 original tracks.
She released her 2nd album title every Struggle it contained 4 of her past singles and 7 original tracks.
When BeForU was rumored to have disbanded in 2009, Riyu did not release any solo songs for about a year until the release of Kimi ga kikoeru in 2010.
Riyu released a new single called Saisho no Melody. This is her first major single to not appear on Oricon Chart.
Riyu stayed inactive due to the fact she had vocal noguls.
On January 23, Riyu did a birthday live event.
- [2005.05.20] RIYU KOSAKA FIRST LIVE at O-EAST 2005
- [2007.11.11] Riyu's Vacation 2007
- [2007.12.29] Kosaka Riyu Making Shashinshu DVD
- [2008.10.05] Four Piece / Live 2008 (BeForU / Riyu Kosaka)
- [2001.11.21] DDRMAX DanceDanceRevolution 6thMIX (Disc 01/ #4 & Disc 02/Track 17: True... (Radio Edit), Disc 01/Track 34: True... (Trance Sunrise Mix), Disc 01/Track 40: true... (Full Version).)
- [2002.05.16] V-RARE SOUND TRACK 1 (Track 06: Firefly -RIYU VERSION-.)
- [2002.06.19] DDRMAX2 DanceDanceRevolution 7thMIX (Disc 01/Track 14 & Disco 02/Track 39: DIVE TO THE NIGHT, Disc 01/Track 17 & Disc 02/Track 07: CANDY♥.)
- [2003.02.27] V-RARE SOUND TRACK 4 (Track 05: CANDY (☆live a little style☆), remixed by NAOKI MAEDA.)
- [2003.02.05] pop'n music 9 AC ♥ CS pop'n music 7 (Disc 01/Track 27: ☆shining☆ with Noria.)
- [2003.03.19] GUITARFREAKS & drummania BEST TRACKS (Disc 01/Track 04: begin.)
- [2003.03.26] DanceDanceRevolution EXTREME (Disc 01/Track 05 & Disc 02/Track 27: LOVE♥SHINE.)
- [2003.04.24] V-RARE SOUND TRACK 5 (Track 07: glacial (radio edit).)
- [2003.09.18] beatmaniaIIDX 9th style Original Soundtrack (Disc 01/Track 29: LOVE♥SHINE.)
- [2003.12.17] GUITARFREAKS 10thMIX & drummania 9thMIX Soundtracks (Disc 01/Track 02: Himawari.)
- [2004.05.19] beatmaniaIIDX 10th style Original Soundtrack (Disc 01/Track 22: SHOOTING STAR.)
- [2004.06.23] GUITARFREAKS 11thMIX & drummania 10thMIX (Disc 01/Track 15: ☆shining☆ (GF&dm style) with Noria.)
- [2005.03.24] V-RARE SOUNDTRACK 10 (Track 02: LOVE♥SHINE (Tropical mix), remixed by Mr.T.)
- [2005.11.28] Pakedio Channel Vol.1
- [2005.10.19] beatmaniaIIDX12 HAPPY SKY ORIGINAL SOUNDTRACK (Disc 02/Track 04: Himawari.)
- [2005.12.22] Pakedio Channel Vol.2
- [2006.01.12] Pakedio Channel Vol.3
- [2006.08.25] Sky Girls ~Opening Theme "Baby's Tears / Kosaka Riyu" & Original Soundtrack~
- [2006.10.27] pop'n music 14 FEVER! AC ♥ CS pop'n music 12 Iroha & 13 Carnival (Disc 03/Track 27: HONEY♂PUNCH,)
- [2007.01.25] DanceDanceRevolution SuperNOVA ORIGINAL SOUNDTRACK (Disc 01/Track 08 & Disc 02/Track 24: HONEY♂PUNCH, Disc 01/Track 12 & Disc 02/Track 31: Baby's Tears)
- [2007.03.08] GUITARFREAKS V3 & DRUMMANIA V3 SOUNDTRACKS (Disc 01/Track 16: Yamato Nadeshiko Damashi.)
- [2010.06.30] Amatsu Misora ni! Soundtrack (Track 03: Kimi ga Kiroeru, Track 36: Kimi ga Kiroeru (Short Ver.).)
- Chikara (LIVE BAND style) (Lyrics)
- DIVE (Lyrics)
- Himawari (Lyrics)
- LOVE SHINE (Lyrics)
- BRE∀K DOWN! (LIVE BAND style) (Lyrics)
- ☆shining☆ (LIVE BAND style) (Lyrics)
- SHOOTING STAR (Lyrics)
- True...(2003 album version) (Lyrics)
- GRADUATION～Sorezore no Ashita～ (unplugged version) (Lyrics)
- KI・SE・KI (Lyrics)
- Scenario (Album Version) (Lyrics)
- Freedom (Album Version) (Lyrics)
- KI・SE・KI(album version) (Lyrics)
- Morning Glory (Lyrics)
- BLACK OUT～I want to be・・・!! (album version) (Lyrics)
- HONEY♂PUNCH (Lyrics)
- DIVE2006 (Lyrics)
- HAPPY HAPPY BIRTHDAY (Lyrics)
- Kagerou (Lyrics)
- Boku no Naka ni Aru Boku janai Boku Dake no Boku to Boku (Lyrics)
- Red Rocket Rising
- Get set GO!! (Lyrics)
- Sakura Mau Toki. (Lyrics)
- Strike Party!!! (Lyrics)
- Izayoi (Lyrics)
- Kyou to Ashita to Shikakui Sora (Lyrics)
- SUPER HIGHWAY (Lyrics)
- Kimi to Sora to Zutto (Lyrics)
- Ijiwaru na Ai (Lyrics)
- Originality (Lyrics)
- Perfect Warriors (Lyrics)
- Determination (Lyrics)
- [2008.02.28] Riyu
Discography Featured In
-  Kamen Rider The Next (voice only)
-  Axion
- Is a big fan of Lord of the Rings
- Gets along with Sayaka best.
- Was the most promoted BeForU member.
- Is good friends with Hoshino Kanako.
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