Osamu Kasai

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Osamu Kasai
Osamu Kasai - 2.jpg
Local 笠井 治 (かさい おさむ)
Born September 24, 1960
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. 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. Kasai and Harada later started working as audio directors for Konami and have been working there ever since. 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 by Michiharu Hasuya 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
1988-08-26 Ys (FC) (イース)
1988-08-30 Keith Courage in Alpha Zone (TG16) (魔神英雄伝ワタル)
1989-02-23 Tama & Friends: 3 Choume Daibouken (FDS)
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)
1989-08-08 Circus Caper (NES) (燃える!お兄さん)
1989-10-20 Tatsu no Ko Fighter (TG16) (竜の子ファイター)
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)
1989-12-08 Seirei Gari (FC) (星霊狩り)
1990-02-23 Tiger Road (TG16) (虎への道)
1990-03-23 Sansara Naga (FC) (サンサーラ・ナーガ)
1990-04-?? Dynowarz: The Destruction of Spondylus (NES)
1990-05-25 Ys II (FC) (イースⅡ)
1990-11-09 Kattobi! Takuhai-kun (PCE) (カットビ!宅配くん)
1990-11-10 Last Armageddon (FC) (ラストハルマゲドン)
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)
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 Effects
1991-06-28 Jinsei Game Densetsu (GB) (人生ゲーム伝説)
1991-07-31 Otaku no Seiza: An Adventure in the Otaku Galaxy (FC) (おたくの星座)
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)
1992-07-03 Light Fantasy (SFC) (ライトファンタジー)
1992-09-25 Ginga Eiyuu Densetsu (SFC) (銀河英雄伝説)
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)
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))
1993-12-02 Teenage Mutant Ninja Turtles: Tournament Fighters (GEN) Sound Producer
1994-03-17 Castlevania: Bloodlines (GEN) (バンパイアキラー(サウンドプログラム))
1994-11-30 Snatcher (SCD)
1996-10-25 Vandal Hearts (PS1)
2001-12-14 Sansara Naga 1x2 (GBA) (サンサーラ・ナーガ1x2)

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