Kumiko, aged 16, is the oldest of three children and the daughter of a mother who is something of a free spirit and a bit of a wild one. One day she comes home from school to find her mother making out with a man – and even worse, once her siblings come home she announces that she’s married him! All three kids are shocked by this development, but then things take a very dramatic turn when that same night their mother is killed in an accident.

Kumiko decides to take over at this point – but their new stepfather wants to help, which is a problem as Kumiko hates him…