Hitoshi Nagano takes a cell phone that a young man named Daiki Hiyama accidentally put on his tray at McDonald's. Hitoshi uses the phone to call Daiki's mother, pretending he is Daiki, and convinces her to wire him 900,000 yen. Three days later, Hitoshi returns home from work to discover Daiki's mother there in his apartment, and she seems to truly believe Hitoshi is her son. Hitoshi's own parents now treat him as a stranger; they, too, have a 'me' living with them instead of Hitoshi. At a loss for what else to do, Hitoshi begins living as Daiki, and no one seems to bat an eye.