On the Japanese island of Amami, despite lacking parental guidance, Kaito and his girlfriend Kyoko try to find their place in the world. While Kaito suffers from the absence of his father, who moved to Tokyo after his birth, Kyoko must come to grips with her mother’s terminal illness.
Narumi is on bad terms with her husband, Shinji, when, one day, Shinji goes missing. He comes back a couple of days later, but he seems like a totally different person, and he is now gentle and tender. He goes for a walk every day. Meanwhile, journalist Sakurai covers the story of a family that was brutally murdered, when an unexplained phenomenon takes place. Shinji Kase tells his wife that he came to Earth to invade.
Mizuki's husband Yusuke has been missing for three years. He suddenly comes back home as a ghost and asks Mizuki to go on a trip with him. Their trip consists of visiting the people that helped Yusuke on his previous travel.
