If you are looking for the score or parts in PDF format, they are primarily available through professional sheet music retailers and digital libraries:

: It depicts the dramatic battle between Perseus and the sea monster Kraken to save Princess Andromeda. RUNDEL Verlag Perseus - Yagisawa - Parts | PDF - Scribd

It often begins with an ethereal, choral texture before building into more intense, rhythmic sections that represent the hero's quest. PDF and Score Availability

Authorized editions are published by De Haske Publications and can be found at retailers such as Sheet Music Plus or Stanton's Sheet Music . Perseus - Yagisawa - Parts | PDF - Scribd