Osamu Kasai

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Osamu Kasai
Osamu Kasai - 2.jpg
Local 笠井 治 (かさい おさむ)
Born 1960-09-24
Birth Place Japan
Nationality Japanese   Japan.svg
Aliases O.Kasai

Osamu Kasai is a Japanese composer, sound designer, and audio producer who has been working on video game music for over 20 years. He attended the Faculty of Literature, Department of Western History at Kyoto University. Kasai practiced jazz piano and was studying Czerny. He also worked part-time at a record store. Osamu started his video game music career in the 1980's when he worked for Advance Communication Company. While working there, him and Masaaki Harada composed the music for many of their titles, mostly for the Famicom. Since Advance Communication ported the Ys games to the NES and SNES, him and Masaaki had to re-arrange the original tracks to the NES, which was a difficult task. Around 1993, Kasai started working as an audio director for Konami alongside Harada. There, he started off working on the company's Genesis games, and even helped develop their audio engine for the system. Besides audio, Kasai has also been credited for game design and programming.

Kasai no longer composes music, but he still plays it on the piano.

Music Development


Osamu utilized a sound driver titled Sound Routine. Music was most likely written in either 6502 assembly machine code or Music Macro Language. Some note octave errors in Sansara Naga (FC) suggest the latter. However, Michiharu had said his music was written in assembly.

Also, Osamu may have had a hand in programming the sound driver, as he has been credited for programming.


Released Title Sample Notes
1988-08-26 Ys (FC) (イース)
With Masaaki Harada.
1988-08-30 Keith Courage in Alpha Zones (TG16) (魔神英雄伝ワタル)
With Masaaki Harada and Michiharu Hasuya.
1989-02-23 Tama & Friends: 3 Choume Daibouken (FDS)
With Masaaki Harada.
1989-07-25 Oishinbo: Kyukyoku no Menu 3bon Syoubu (FC) (美味しんぼ 究極のメニュー三本勝負) Arranger?
1989-08-08 Circus Caper (NES) (燃える!お兄さん)
With Masaaki Harada.
1989-10-20 Tatsu no Ko Fighter (TG16) (竜の子ファイター) With Michiharu Hasuya, Masaaki Harada, and Nobuhito Nakayama.
1989-11-24 Jack Nicklaus Turbo Golf (TG16) (ジャック・ニクラウス チャンピオンシップ・ゴルフ)
With Masaaki Harada.
1989-12-08 Seirei Gari (FC) (星霊狩り) With Masaaki Harada.
1990-02-23 Tiger Road (TG16) (虎への道) With Masaaki Harada and Shinji Nakayama.
1990-03-23 Sansara Naga (FC) (サンサーラ・ナーガ)
With Kenji Kawai, Masaaki Harada, and Shinji Nakayama.
1990-04-?? Dynowarz: The Destruction of Spondylus (NES)
With Masaaki Harada and Nobuhito Nakayama.
1990-05-25 Ys II (FC) (イースⅡ)
With Masaaki Harada and Shinji Nakayama.
1990-11-09 Kattobi! Takuhai-kun (PCE) (カットビ!宅配くん) With Masaaki Harada and Hiroyasu Nishiyama.
1990-11-10 Last Armageddon (FC) (ラストハルマゲドン) With Michiharu Hasuya, Masaaki Harada, and Hiroyasu Nishiyama.
1990-12-07 Chibi Maruko-Chan Okozukai Daisakusen! (GB) (ちびまる子ちゃん おこづかい大作戦!) Composer?
1990-12-26 Heavy Unit: Mega Drive Special (SMD) (ヘビーユニット メガドライブ・スペシャル) With Michiharu Hasuya and Masaaki Harada.
1991-02-22 Niji no Silkroad: Zigzag Boukenki (FC) (虹のシルクロード 〜ジグザグ冒険記〜) Sound Programming with Masaaki Harada and Michiharu Hasuya.
1991-06-28 Jinsei Game Densetsu (GB) (人生ゲーム伝説) With Michiharu Hasuya and Masaaki Harada.
1991-07-31 Otaku no Seiza: An Adventure in the Otaku Galaxy (FC) (おたくの星座) With Masaaki Harada.
1991-09-27 Ys III: Wanderers from Ys (FC) (イースⅢ ワンダラーズフロムイース)
With Michiharu Hasuya and Masaaki Harada.
1991-12-20 Wakusei Woodstock: Funky Horror Band (MCD) (ファンキー・ホラー・バンド 惑星ウッドストック) Composer?
1992-07-03 Light Fantasy (SFC) (ライトファンタジー) With Michiharu Hasuya and Takashi Tsurutani.
1992-09-25 Ginga Eiyuu Densetsu (SFC) (銀河英雄伝説) With Michiharu Hasuya, Junko Yokoyama, and Kunihiro Someya.
1992-11-13 Paladin's Quest (SNES) (Lennus:古代機械の記憶) Sound Effects
1992-12-04 Mecarobot Golf (SNES) (芹沢信雄のバーディトライ)
With Michiharu Hasuya and Takashi Tsurutani.
1993-07-25 Lethal Enforcers (GEN) (リーサルエンフォーサーズ) Sound Programmer with Atsushi Fujio.
1993-08-05 Rocket Knight Adventures (GEN) (ロケットナイトアドベンチャーズ(サウンドプログラム)) Sound Program with Shigemasa Matsuo and Hideto Inoue.
1993-12-02 Teenage Mutant Ninja Turtles: Tournament Fighters (GEN) Sound Program with Atsushi Fujio.
1994-03-04 Double Dribble: The Playoff Edition (GEN) (ハイパー ダンク ザ プレイオフ エディション) Sound Program with Atsushi Fujio.
1994-03-17 Castlevania: Bloodlines (GEN) (バンパイアキラー)
Sound Program with Atsushi Fujio.
1994-09-15 Sparkster (SNES) (スパークスター) Sound Programmer with Akira Soji.
1994-11-30 Snatcher (SCD) (スナッチャー) Sound Programmer with Akira Soji.
1994-??-?? Lethal Enforcers II: Gun Fighters (GEN) Sound Driver with Atsushi Fujio.
1995-05-19 Gokujou Parodius Da! Deluxe Pack (SAT) (極上パロディウスだ! DELUXE PACK) With Hiroshi Tamawari and Kiyohiko Yamane.
1996-03-22 Ganbare Goemon: Uchuu Kaizoku Akogingu (PS1) Sound Program
1996-10-25 Vandal Hearts (PS1) (ヴァンダルハーツ ~失われた古代文明~) Sound Program
1997-03-20 Castlevania: Symphony of the Night (PS1) (悪魔上ドラキュラX 月下の夜想曲) Program/Sound Effects
1997-11-13 Azure Dreams (PS1) (アザーライフアザードリームス) Sound editor
1997-11-27 Vandal Hearts: Ushinawareta Kodai Bunmei (SAT) (ヴァンダルハーツ ~失われた古代文明~) Original Staff
1998-06-25 Akumajou Dracula X: Gekka no Yasoukyoku (SAT) (悪魔上ドラキュラX 月下の夜想曲) Original Staff
1999-11-25 Tokimeki Memorial 2 (PS1) (ときめきメモリアル2) Sound Driver Program with Toshiyuki Mizoguchi.
2001-12-14 Sansara Naga 1x2 (GBA) (サンサーラ・ナーガ1x2) With Kenji Kawai and Tsukasa Tawada.
2020-03-03 Castlevania: Symphony of the Night (IOS) Program/Sound Effects

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