In a household of six, one day an unexpected guest suddenly moved in next door. The newcomer is named Mango Wunai (played by Yusuke Nakayama), who was accused years ago of murdering a family of three, and ultimately regained his freedom thanks to the ruling of a seasoned judge, Isamu Kajima (played by Ayato Ibu). Coincidentally, Kajima is the male head of the household next door. Wunai pays a visit, claiming to be very grateful to the judge for his help, insisting on repaying this kindness no matter what. The other members of the Kajima family are taken aback and feel nervous, especially the judge's daughter-in-law, Yukimi (played by Yuka), who is constantly worried about what Wunai might be up to. At this time, the surviving relatives from the murder case approach Yukimi and warn her to be careful of Wunai, as he will surely bring chaos to their family. Perhaps the words of the relatives are true; ever since Wunai moved in, the Kajima family has fallen into a very discordant and bizarre cycle...