First Love Sisters (Japanese: 初恋姉妹, Hepburn: Hatsukoi Shimai) is a Japanese manga written by Mako Komao and illustrated by Mizuo Shinonome (characters) and Reine Hibiki (scenario) which was first serialized in the now-defunct yuri josei manga magazine Yuri Shimai on June 28, 2003 under the title Koi Shimai (恋姉妹). The manga was transferred to Comic Yuri Hime, Yuri Shimai's successor, published by Ichijinsha. The final chapter was published in the eleventh issue of Comic Yuri Hime, and three bound volumes have been released, with the final one on April 18, 2008.