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.