War photojournalist Yasuyuki Tsukahara married popular manga artist Yuki Sonoda and had children. Because of Yasayuki's drinking problems the couple divorced. Yasuyuki is now coughing up blood, hospitalized, and violent. Even with all of these problems Yasuyuki can't give up drinking alcohol. His family gets tired. Yasuyuki is then hospitalized in an alcoholic ward. There he finds comfort living with other patients and having conversations with doctors. With the help of his family, Yasuyuki recovers mentally and physically, but his body has already paid a heavy toll.

Ultraman Saga opens with a powerful apocalyptic vision of Tokyo, buildings destroyed and the city seemingly devoid of life. We are soon introduced to the Earth Defense Force (EDF), Team U (played by members of the female idol group AKB48). They and a group of young children and the last survivors on planet Earth after the world was invaded by the evil Alien Bat, the rest of the human population having been abducted.

A motorcycle accident in the city will be the precursor to a series of bizarre phenomena being revealed consecutively. Meanwhile, a girl named Yoko possesses a second sight which allows her to see strange things invisible to others.