Koikyuu

From Broccoli:
Breaking the Rules in the Game of Love! When you're a cupid in training, you gotta play by the rules: No socializing with your targets. Don't consort with the enemy. Practice archery every day. Maybe if someone had told Koi, Ai, and Ren, they could stay out of trouble. The girls try to finish their missions by the book, but something always gets in the way.