Yasaka Kyoiki is a housewife who lives a modest life with her husband Kazuki and son Mamoru. Because of his greying past, he's estranged from both sets of relatives... They were not rich by any means, but they still had a happy family of three...

One day, an acquaintance from his delinquent days... visits for the first time in nine years. The man is Ryuji Sagara, who has just been released from prison for murder. He threatens Kyoki with a vicarious confession, being told that the real murderer is Kazuki and that he's here to collect his reward!

Unaware that this is a lie, Kyoki is trapped and framed... She is trained to become Ryuji's bitch.