20 years ago, an elementary school student falls on an island in the northern tip of Hokkaido. A teacher and 6 students makes contact through songs. What happened to the student who fell? The teacher returns 20 years later to meet with her former students. ~~ Based on Kanae Minato's short story "Nijunengo no Shukudai,” from Kanae Minato's "Oufuku Shokan" (September 21, 2010 - published by Gentosha).