Miki Koishikawa is an energetic highschool girl. She's in the girls tennis club. She isn't very happy about the swapping
spouses thing, but after a while she gets used to it and begins to enjoy it. At first she doesn't like Yuu, but soon she realizes
that he's really a sweet guy who likes to tease her. She also has to deal with her middle school crush, Ginta, who suddenly
confesses that he loved her too! On top of that, Miki is also in love with Yuu!
Yuu Matsuura loves to tease Miki. He is the same age as her and her step-brother. He teases Miki so much that at one
point Miki hated him. After she'd gotten used to him though, she starts to like him. She once compared him to marmalade. Bitter
at first taste, but sweet all the same. This is what inspired the title. Yuu is also a really good tennis player. Though it
takes a while for Miki to fall in love with Yuu, I suspect Yuu was in love with Miki from the start. For one thing, he did
sneak a kiss on her while he thought she was sleeping in the nurses office. All things set aside, Yuu and Miki make a perfect
couple. Yuu also has his secrets, which will give both of them the shock of a lifetime.
Meiko Akizuki is Miki's best friend since middle school. She's a mysterious sort of person, who has a lot of things going
on that Miki doesn't know about. She is part of a lit magazine and actually got a book published at one point. Her biggest
secret is her relationship with their teacher, Mr. Namura.
Ginta Suou is Miki's best guy friend and he rocks at tennis. He's also Miki's middle school crush. When they were in middle
school Miki wrote Ginta a love note, but Ginta's friends saw it and Miki found out. This upsetted Miki, so she stopped talking
to him for a while. Now they're friends again, and things seem to be going well. That is, until Ginta confesses that he really
had liked her back in middle school but wasn't able to tell her, and that he still likes her. Miki's feelings have changed
though, so that gives her more to deal with.
Arimi Suziki is Yuu's ex-girlfriend. She says that she and Yuu were meant for eachother, but Yuu seems to think otherwise.
When she comes to visit she notices how close Miki is to Yuu and pretends to go out with Ginta in order to make Miki jealous
and get her away from Yuu. This plan doesn't work though, but it may leave another couple behind. ^_T By the way, in the manga,
Arimi has brown hair, not green hair. I just couldn't find a good picture of her with brown hair. The anime messes everything
Mr. Namura, called Na-chan by his students, is Miki, Yuu, Ginta, and Meiko's homeroom teacher. He's also the tennis coach.
He has a secret relationship with Meiko.
Satoshi Miwa is a funny guy and one of Yuu's best friends. At first when everybody saw Yuu and Satoshi together, they thought
the were gay. It was really funny! *laughs* Then Yuu thought that Satoshi was his brother (don't ask why, because it will
spoil the story). In the end, they just ended up being really good friends. Satoshi also has a crush on Meiko, and went to
desperate measures like stealing a kiss! She keeps rejecting him, though, because she has a secret love. (-_T)
Suzu Sakuma is a popular model who is obsessed with pretty things. She carries around a camera just in case she finds something
pretty to take a picture of. Since Yuu is good-looking, she thought Yuu should have a pretty girlfriend. Therefore, she was
disappointed when she saw Miki, because she thought Miki was "average". When she saw Meiko, though, she got really
excited and thought she was perfect for Yuu. After a few misconceptions take place, Suzu gets the wrong idea that Meiko is
in love with Yuu. With this idea in her head, she goes through all means to seperate Yuu and Miki and get Yuu with Meiko!
Kei is a highschool drop-out and a gifted pianist who works at the same place as Miki. They meet in an awkward way, when he
accidentally looks up her skirt, and they end up on top of eachother (lol). After that they seem to become friends, and Kei
developes a crush on Miki. He's not very happy when he realizes that Miki has a boyfriend. He'll do anything to make them
break up, even lie to Yuu and Miki and create a bunch of misunderstandings. In the end, Miki gives him a wake up call, and
he goes back to school and starts playing the piano again after quitting for a while. He and Suzu start seeing eachother a
bit afterwards. Though, he says she's just an annoying girl who follows him around, his actions prove otherwise! ^_T