Best Friend (1995)

Kouhei asks his girlfriend Kaede to marry him. He also reveals that his company going to transfer him to London office and that he would like his bride-to-be to come along. As Kaede walks home she bumps into Yuuko, a girl from far-off Yaizu who has come to town for meeting with her ex-boyfriend's buisiness partner. The girls inadvertently swap addresses books in the confusion, leading Kaede to discover that Yuuko has meeting planned with Kouhei. She immediately expects the worse.