Ishii Kentarou is a Japanese lyricist, composer, arranger, and producer from Osaka.

He began learning piano and electone at the age of three. During his junior high and high school years, he formed a rock band, serving as vocalist and songwriter, performing mainly at live houses around Osaka for several years.

After the band disbanded, he shifted his focus to composing and arranging. A demo CD he produced caught the attention of record labels and music agencies, leading him to begin his full-fledged career as a composer.

He currently provides songs and arrangements for a wide range of artists across various genres and labels.