S-Friends: Dokoku.

Third chapter in the "S-Friends" series. Shoko Morimura works at a mail-order company and raises her only daughter as a single mother. She and her first love, obstetrician and gynecologist Kitada Kazuki, have rekindled their friendship and are having intense trysts. While on a remote island in the countryside, Kazuki finds himself practicing medicine, and as he looks down on himself, he begins to imagine a future with Shoko. Moved by Kazuki's feelings, Shoko prepares to take a big step toward happiness together. But just as they are about to take their first steps, her ex-husband, Hiroshi, turns up, stalking her and plotting to drive a wedge between them.