The story tells that Kimura Takuya plays Iejiku, an office worker at a securities company. He has experienced divorce and has a son with his current wife, Megumi (played by Ueto Aya). However, due to an accident, he lost his memory of the past five years, making him feel that his wife and son are fake like wearing masks, and he has more affection for his ex-wife and daughter who divorced him five years ago. In order to regain the blank five years of memory, he will take 10 mysterious keys at hand to find his true self.