Star Ocean: The Second Story (スターオーシャン セカンドストーリー, Sutā Ōshan Sekando Sutōrī) is a seven volume manga series written and illustrated by Mayumi Azuma. Based on the tri-Ace role-playing video game Star Ocean: The Second Story, it follows the exploits of Claude C. Kenny, a young ensign in the Earth Federation who finds himself stranded on the Planet Expel. He meets Rena Lanford, a young girl living in the village of Arlia who declares that he is the legendary warrior their legends speak of who will save their troubled world from disaster. The series was serialized in Monthly Shōnen Gangan from 1998 to 1999.

Studio Deen adapted the manga series into a twenty six episode anime series entitled Star Ocean EX which aired on TV Tokyo from April 3, 2001, until September 25, 2001. The anime series was released to Region 1 DVD by Geneon Entertainment. To complete the story left unfinished by both the manga and anime, five drama CDs were released in Japan, using the same voice actors from the anime series.