My Beautiful Girl Mari(2002)

Mari Iyagi

When office worker Nam-woo receives a package from childhood friend Jun-ho it transports him back to their last summer together. Back to their hometown in a small fishing village it the last few days before Jun-ho left for boarding school in Seoul. When a marble and an abandoned lighthouse had the power to transport him to a fantastic world where a mysterious flying girl named Mari lived.

(Source: Anime News Network)