Keiko Koike

Teacher Kawashima Haru takes a position on a remote island off the coast of Hokkaido, where she takes charge of six students. However, she is later forced to leave after an accident occurs. 20 years later, Haru learns that one of her former students has committed a crime, and eventually returns to the island once more.

One day, his girlfriend Saki, who is in coma by a car accident, appears in front of Haruyuki. Saki says she was given a week and makes a box lunch for Haruyuki as she used to always do. Since then, every single day becomes special for him.