I Want to Fall in Love "He's Handsome, but I Can't Forgive Him!"
The episode begins with Miki saying that her life is too boring and she wishes it would be more exciting. And she kinda got her wish... Her parents were getting divorced. But this was a very strange divorce. They were just gonna switch partners with another family, the Matsuuras. During their romantic trip to Hawaii, they met the Matsuuras. Miki's dad fell in love with Mrs. Chiyako Matsuura and Miki's mom fell in love with Mr. Youji Matsuura. So they talked about it and decided to switch partners.
Aired 13/03/1994EP 1 - I Want to Fall in Love "He's Handsome, but I Can't Forgive Him!"
Marmalade Boy
Miki Koishikawa lived a normal life - until her parents tell her they'll get divorced.. She doesn't agree, until she meets Yuu Matsuura... the handsome son of another couple, with whom her parents are switching spouses. They all live together now in an enormous house, and Miki and Yuu find themselves falling in love. They'll have to struggle with their own feelings, other people who want to be with them, and whatever Lady Luck and Fate throws in their ways...
(Source: Anime News Network)