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In the end of Rama VI, the government announced that there would be a marriage certificate supporting the monogamy campaign. Only one wife would be the legal wife with rights to all the assets. Four women married to the same man start a war against each other to try to be the legal wife.

Ritsuko discovers an old cassette tape, while packing her things to move into a new apartment. She listens to the tape and hears the voice of a frail girl saying "I'm so afraid of tomorrow that I can't fall asleep. I think I'm going to die soon." Soon after, Ritsuko leaves a sparse note for her fiance Saku, "I'm going away for a while. Don't worry about me. - Ritsuko." During this time a Typhoon is approaching Japan and Saku watches the news at his friends bar. He spots his fiance walking in the background of a news report at the airport. He knows Ritsuko is going to her home town of Shikoku and Saku decides to go back there as well, the place where he grew up and first met Ritsuko and the girl on the tape.