9 Bulan tells the story of Welly, played by Fero Walandow, who is willing to marry Karen (Pamela Bowie). The contract marriage was carried out by Welly in exchange for money, which would be used as a dowry to marry Andini, the girl he loved very much. Problems arise because Andini also asks Welly to marry on the day of
Wiwin gave birth to a child as a result of her relationship with a mermaid named Tiara.