Ieji Hisashi, a salaryman who works for a securities company, has a fuzzy memory of the recent five years because of an accident at his job posting. His wife of five years, Megumi and their 4-year-old son seem to wear masks. He can neither tell their facial expressions nor their emotions. He also struggles about his love for them. On the other hand, Ieji feels an attachment to his ex-wife, whom he divorced five years ago, and their daughter. What sort of days did he have in those five years which are a blank to him? Ieji sets out on a journey to find his past self with a mysterious bunch of 10 keys that he has. He becomes aware that he was a cold, career-minded man before the accident, and the persona that is gradually revealed is beyond the imagination of his present kindhearted self.
Akira Shimazaki (Takuya Kimura) lives with his middle school student son. He used to work as a bodyguard, but, due to an incident, he now works as a security guard at a construction site. The private security company where he works establishes a new bodyguard division. Hiding his past as a bodyguard, Akira Shimazaki begins work as a novice bodyguard.
Aino Hingo used to work as an associate professor of ethnology. He now works as the director of a matchmaking agency. His assistant is Sister Elizabeth. The high entrance fee at the matchmaking agency is two million yen, but the matchmaking agency has a 100% success rating for their clients getting married. They match customers based on the client's conditions. The secret behind their 100% marriage rate is Shingo Aino's counseling, relying on his knowledge in ethology.
Mayako Mizukoshi is a 32-years-old housewife and she has been married for 5 years. Mayako is not happy with her marriage. Her husband doesn't look at her as a woman. Music critic Michihiko Kudo appears in front of her. He approaches Mayako and they fall into a forbidden love.
Musashi Miyamoto left his village and ended up fighting in the battle of Sekigahara with his friend Matahachi, but Musashi Miyamoto lost Matahachi. He goes back to the village to inform Matahachi's family about what happened. At the village, he is persecuted by people there. Musashi Miyamoto becomes worn down physically and mentally. At this time, Soho Takuan appears in front of Musashi Miyamoto. He then rebuilds his life with his sword. Musashi begins to travel for warrior training. He meets many masters of the sword and grows as a person.
