&quot;Miki is a lively high school student, who is on the Toryo High School tennis team. She is cheerful, friendly, supportive, outspoken, tomboyish and good-hearted. On the other hand, she can also be insecure, whiny, clingy, and very emotionally dependent on others. She had a part-time job working in an ice cream store, called Bobson's. Later, she works in a small decoration shop.    When she was in junior high, she confessed her love to a male friend of hers named Ginta, but it was a disaster and Miki ended up heartbroken. Because of their friendship, Miki was shocked. But eventually she got over it and became friends with him again.    When Miki was in high school, her parents went on a trip to Hawaii and decided to swap spouses with another couple. The other couple had a son the same age as Miki, and they all moved into a large house to live together. That boy was Yuu Matsuura, and Miki started to fall in love with him as they came to know each other better. However, Miki was very uncertain of herself and became jealous because Yuu was always surrounded by other girls, several of them being very beautiful while Miki was only average-looking.&quot; from Wikipedia

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)

Michelle Suzanne Ruff is an American voice actress known for her work in anime and video games. Height 5' 3½" (1.61 m). Georgette Rose is the name of Michelle Ruff's mother, and Michelle used her mother's name as a pseudonym in her early career.

__Nickname:__  Mari-ane (マリ姉)
__Height:__ 157cm

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Miki’s life was pretty ordinary until the day her parents told her they were swapping spouses with another couple! Thanks to this unconventional arrangement, Miki now has two new stepparents and a hot new stepbrother, Yuu! Miki isn’t exactly thrilled with her new situation, and though Yuu is super cute, he’s also kind of a jerk. Can Miki sort out her complicated feelings for him and come to terms with her new family?
 
(Source: Seven Seas Entertainment)

A prelude to Marmalade Boy the TV series. Yuu remembers the day when his parents decided to divorce each other and remarry with another married couple. Toubled by the news, Yuu decides to take a walk, on which he spots a girl he falls in love with at first sight. He decides to follow this unaware girl and falls more in love with her. However he discovers who the girl really is...she's the daughter of his parents' new lovers. 
(Source: Anime News Network)

Set 13 years after the original series, the story focuses on Miki and Yuu's little siblings, Rikka and Hajime.