Miki's parents decide to "swap" partners with another married couple.
When they do, the other couple has a son named Yuu. Yuu and Miki
eventually fall in love, but people keep coming and going. Some try to
break up Miki and Yuu. Yuu is trying to find who his real father is.
When he does him and Miki can't be together anymore. However, they
decide to get together anyways. Rumi and Jin Koishikawa unexpectedly
announce to their daughter, Miki, that they are going to get divorced.
Not only that, but they plan to swap partners with another couple,
Chiyako and Youji Matsuura (who have a son, Yuu that's same age as
Miki), and get re-married. The families move in together, and a romance
develops between Miki and Yuu. Quite a few people try to break Miki and
Yuu apart. Their romantic relationship continues to thrive and, despite
all obstacles, they are together in the end.

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