This 2001 single saw Koyanagi returning to the J-pop and R&B sounds that had defined her early career, featuring a blend of smooth vocals and contemporary production.
- "Deep Deep" was released on April 25, 2001, by WM Japan.
- The single followed her 2000 album "Believe in Love".
- It charted at number 41 on the Oricon weekly singles chart.
Yuki Koyanagi is a Japanese pop and R&B singer, active since the late 1990s. She was one of the early commercially successful artists in Japan to blend Western R&B styles with J-pop conventions.
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