This is the discography of the I've Sound singer Kotoko.
| Year | Album details | Peak Oricon chart positions | Sales (JPN) | Certifications (sales thresholds) |
|---|---|---|---|---|
| 2000 | Sora o Tobetara...
| — | ||
| 2004 | Hane
| 7 | 40,383 | |
| 2005 | Garasu no Kaze
| 6 | 47,706 | |
| 2006 | Uzu-maki
| 16 | 36,965 | |
| 2009 | Epsilon no Fune
| 12 | 15,475 | |
| 2011 | Hiraku Uchū Pocket
| 21 | ||
| 2013 | Kūchū Puzzle
| 19 | ||
| 2018 |
| 29 | ||
| 2019 | Tears Cyclone: Sei
| 26 | ||
| Year | Song(s) | Peak Oricon chart position[1] | Total sales | Certification | Album | |
|---|---|---|---|---|---|---|
| 2001 | "Love a Riddle" | — | ||||
| 2002 | "Shooting Star" | 62 | ||||
| 2003 | "Second Flight" (with Hiromi Satō) | 15 | ||||
| 2004 | "Oboetete ii yo/DuDiDuWa*lalala" | 15 | Garasu no Kaze | |||
| "Re-sublimity" | 8 | 50,119 | ||||
| 2005 | "Chi ni Kaeru (On the Earth)" | 19 | 28,706 | |||
| "421: A Will" | 16 | 13,667 | Garasu no Kaze | |||
| 2006 | "Face of Fact (Resolution ver.)" | 21 | ||||
| "Being" | 4 | 34,736 | Uzu-maki | |||
| "Chercher" | 16 | 17,090 | ||||
| 2007 | "Kirei na Senritsu" | 18 | 12,249 | |||
| "Hayate no Gotoku!" | 7 | 33,421 | Epsilon no Fune | |||
| "Shichiten Hakki Shijou Shugi!" | 8 | 28,619 | ||||
| "Real Onigokko" | 15 | 13,763 | Epsilon no Fune | |||
| 2008 | "Blaze" | 13 | 26,813 | |||
| "Special Life!" | 13 | 14,502 | ||||
| "U Make Ai Dream" | 46 | |||||
| 2009 | "Snipe" | |||||
| "Ao-Iconoclast / Pigeon-The Green-ey'd Monster" | 26 | 7,003 | ||||
| "Daily-daily Dream" | 16 | 10,428 | ||||
| "Screw" | 24 | 4,649 | ||||
| 2010 | "Hekira no Sora e Izanaedo" | 18 | 7,618 | |||
| "Loop-the-Loop" | 18 | 4,304 | Kūchū Puzzle | |||
| 2011 | "Light My Fire" | 19 | ||||
| "One-Chance | " (with Hiromi Satō) | |||||
| 2012 | "Unfinished" | 14 | Kūchū Puzzle | |||
| "Restart" | 37 | |||||
| 2013 | "Kaiki Shinsei: Recurrent Nova/Natsukaze Nostalgia" (with Hiromi Satō) | 34 | ||||
| 2014 | "Tough Intention" | 34 | ||||
| "Zone-It" | 48 | |||||
| 2015 | "Art As" | |||||
| 2016 | "Plasmic Fire" (with Altima) | 19 | ||||
| 2022 | "PHANTOM PAIN" (with ZYTOKINE) |
| Year | Song(s) | Album | Ref. | |
|---|---|---|---|---|
| 2000 | "Prime" (with Aki) | Dear Feeling | ||
| "Sora Yori Chikai Yume" (Second Track) | ||||
| "Ashita no Mukō" | ||||
| 2002 | "Namida no Chikai" (Album mix) | Disintegration | ||
| "Flow: Mizu no Umareta Basho" | ||||
| "I Can't Get Over Your Best Smile" | ||||
| "Resolution of Soul" | ||||
| "Wing my Way" (Album mix) | ||||
| "Kimi yo, Yasashii Kaze ni Nare" | ||||
| "Dirty Boots" (as Outer) | Dirty Gift | |||
| "Ano Hi no Kimi e" | Onegai Teacher 2nd Vocal Album - Stokesia | |||
| "Snow Angel" | ||||
| "Amethyst" | Tsumamix Vocal Collection | |||
| 2003 | "Face of Fact" | Lament | ||
| "Save Your Heart" (Album mix) (with Kaori Utatsuki) | ||||
| "Kageri" (Album mix) | ||||
| "Feel in tears" | ||||
| "Natsukusa no Senro" (with Kaori Utatsuki) | ||||
| "Lament" | ||||
| "Heart of Hearts" | Outflow | |||
| "Close to me..." | ||||
| "Sensitive" | ||||
| "Change My Style: Anata no Konomi no Watashi ni " | Short Circuit | |||
| "Ren'ai Chu!" (Remix) (with Kaori Utatsuki) | ||||
| "Sakuranbo Kiss: Bakuhatsu Damo n" | ||||
| "You're My Treasure" (Remix) (with Aki and Rimikka) | ||||
| "Achichina Natsu no Monogatari" | ||||
| "Magical Sweetie" | ||||
| "Cream+Mint" | ||||
| "Omoide wa Kaze no Naka de..." | ||||
| "Short Circuit" | ||||
| 2004 | "Namida no Chikai" (the divine pledge of tears) | I've Remix Style Mixed Up | ||
| "Boundary Line" | Silent Half Special CD | |||
| 2005 | "Abyss" | Collective | ||
| "We Survive" | ||||
| "Lupe" | ||||
| "Imaginary Affair" | ||||
| "Trust You're Truth: Ashita o mamoru yakusoku" | ||||
| "Collective" | ||||
| 2006 | "Allegretto: Sora to Kimi" | Kono Aozora ni Yakusoku o Special CD | ||
| 2007 | "Nee, ...Shiyō yo!" | Short Circuit II | ||
| "Seishun Rocket" | ||||
| "Princess Bride!" | ||||
| "Atarashii Koi no Katachi" (Short Circuit Edit) | ||||
| "Mighty Heart: Aru Hi no Kenka, Itsu mo no Koigokoro" | ||||
| "Hajimemashite, Koi" | ||||
| "Otomegokoro tasu Nekomimi no Heihōkon wa Mugen" (with Eiko Shimamiya) | ||||
| "Kyururun Kiss de Jumbo" | ||||
| "Princess Brave!" | ||||
| "Maple Syrup" | ||||
| "Double Harmonize Shock! | " (with Kaori Utatsuki) | |||
| "Synthetic Organism" (as Outer) | I've Mania Tracks Vol.1 | |||
| "Hallucino" (Remix) | ||||
| "Time Heals All Sorrows" | ||||
| "L.A.M Laze and Meditation" (2001 P.V Long Arrange Mix) (as Outer) | ||||
| "Crossed Destiny" | ||||
| "Philosophy" (Proto type Mix) | ||||
| "Leave Me Hell Alone" (as Outer) | ||||
| 2008 | "Suppuration -core-" (G.M.S. remix) | Master Groove Circle | ||
| "Real Onigokko" (Ben Watkins from Juno Reactor remix) | ||||
| "Re-sublimity" (Shiva Joerg & Hard Stuff remix) | ||||
| "Uzu-maki" (Eat Static remix) | ||||
| "Kisetsu no Shizuku" | The Front Line Covers | |||
| "Belvedia" | ||||
| 2009 | "Ha! | ppiness" (as Outer) | I’ve Mania Tracks Vol. II | |
| "Prime: "Thank you" and "From now"" | ||||
| "Absurd" | ||||
| "Yakusoku" | ||||
| "Cave" | ||||
| "Fatally" | ||||
| "Seishun Rocket" (Short Circuit II Edit) (with Kaori Utatsuki) | ||||
| "Akanezora: Sore ga Bokura no Sekai Datta" | Maji de Watashi ni Koi Shinasai | Special CD | ||
| 2010 | "Blossomdays" | Short Circuit III | ||
| "Raspberry" | ||||
| "Crash Course: Koi no Tokubetsu Lesson" (with Kaori Utatsuki) | ||||
| "I need magic: Tokenai Maji Kyun" | ||||
| "Omamagoto" | ||||
| "Stars Biscuit" | ||||
| "Swift Love: Kenzen Danshi ni Monomōsu" | ||||
| "Lilies line" | ||||
| "Yumemishi Boom! Boom | " | |||
| "Jōshiki! Butler Kōshinkyoku" | ||||
| "Hoshizora Interceptor" (with Kaori Utatsuki) | ||||
| "La clef: Meikyū no Kagi" | Extract | |||
| "Restoration: Chinmoku no Sora" | ||||
| "A Piacere" | ||||
| "Oblivion" | ||||
| "Jihad" | ||||
| "Leaf Ticket" | ||||
| "Ketsudan no Entrance" | ||||
| "Onaji Sora no Shita de" | ||||
| "Gensō no Prism" | ||||
| "Hallucino" | ||||
| "Undying Love" | ||||
| "Cross Up" | I've Mania Tracks Vol. III | |||
| "Loose" | ||||
| "I Pray to Stop My Cry" | ||||
| "Gensō no Prism" | Prism Magical Special CD | |||
| 2011 | "Fly to the Top" | Tribal Link | ||
| "Immoral" | ||||
| 2012 | "U Make Ai Dream" | Level Octave | ||
| "Genzai no Requiem" (Album mix) | ||||
| "Bloom" | ||||
| "Presto" | ||||
| "U" | Comic Market CD 83 | |||
| "Wing of Zero" | ||||
| 2013 | "Kirameku Otome" | Nekoneko Soft' Soshite Kirameku Otome to Himitsu 5 Special CD | ||
| 2014 | "Wing of Zero" | Evidence Nine | ||
| "Reboot On/↓0" | ||||
| "Soupir D'Ange" | ||||
| "Love Mission! | Nanda. Tada no Koi ka" | |||
| 2016 | "Stardust Train" | The Time: 12 Colors | ||
| 2017 | "Sign of Suspicion" | Alive | ||
| "Imaginary Affair" (2017 Version) | ||||
| 2018 | "Erika" (with Tatsh) | War of Brains Original Soundtrack | ||
| "Instincts Answer" | ave;new Concept Mini Album Labyrinthine Nerve | |||
| 2022 | "INTERNET OVERDOSE" (with Aiobahn) | NEEDY GIRL OVERDOSE official soundtrack | ||