Miki just wants an ordinary family, but her life is turned upside-down when her parents meet the Matsuuras, and she winds up living in a house with four parents and a stepbrother she can't stand.
Miki's boy troubles spill over onto the tennis court when Ginta's doubles partner is injured and his rival Yuu is the only one who can fill in, making Miki wonder which boy she should support when she likes them both.