"Blue Water" is a power pop piece, in line with what was going on in part of Japanese popular music at that time with female groups such as Princess Princess and Pink Sapphire and singers like Mariko Nagai（永井真理子）and Kahoru Kohiruimaki（小比類巻かほる）at the fore. I loved the bursts of energy that Morikawa brought to the song (lyricist: Etsuko Kisugi [来生えつこ]; composer: Yoshimasa Inoue[井上ヨシマサ]) along with the synths and the electric guitar solo.
The videos above shows both the opening and ending themes as they were played in the actual program itself. "Blue Water" was a great musical introduction to the adventure that was to play out in each episode. It went as high as No. 17 on the Oricon weeklies.
Both songs are available on the album, "The Secret of Blue Water -- Vocal Collection" released in 1991 by Toshiba EMI.