Miki Falls (2007)

Blurb:
First of an exciting new graphic-novel quartet for teenagers by renowned comic book artist Mark Crilley. Miki is intrigued by handsome Hiro, a quiet and secretive boy who has just arrived at her rural school. But Hiro is even more mysterious than Miki realises: as she overcomes his reluctance and slowly gets him to open up, she is drawn into an amazing new world. Hiro is a 'deliverer', a real-life cupid who keeps love alive in the world. He works full-time to maintain the balance, gathering the dying flame of love from those on the verge of breaking up and transferring it carefully to new couples. His private nature is an essential part of his job -- he is not sentimental about love, viewing it merely as a commodity to be distributed. But as his feelings for Miki grow, both their lives are going to get complicated!

Source: www.anisearch.com/manga/5513