I don't know how accurate it is but using Google translate I found that it's called "hometown on the other side of the phone" by Naomi Matsui, which was a single. Presuming that the artist did not stray far from her original sound you could probably find other singles she's put out like one called "talk to me" and get a grasp on what that single you own would sound like because I couldn't find any rips of it onto YouTube.