Aliens have been emigrating to Earth secretly, but only a handful knows about this truth. Living in such a society, the main character Hiroyuki Kudo begins working at a private security organization E.G.I.S. (Enterprise of Guard and Investigation Services). The organization takes care of cases related with aliens, and Hiroyuki works day and night to protect peace. However, there lies a huge secret in him, which he himself is not aware of. He carries Ultraman Taiga’s “particle of light”. The new story begins as Taiga’s powers revive from Hiroyuki’s body!

Kyoko Muromachi (Reiko Takashima), Yayoi Ichijo (Yoshiko Miyazaki) and Misuzu Yasaka (Atsuko Takahata) work at a police station. Kyoko Muromachi works in the general affairs section, Yayoi Ichijo in public relations section and Misuzu Yasaka in the cafeteria as a cook. Even though they are not detectives, they obtain information about cases and gather at the police station cafeteria to analyze the information. They actually find tips that can solve cases.

In Mimasaka, Okayama Prefecture, a ronin student named Keiya leads a listless life. One day, pianist Rika arrives in Mimasaka. Keiya starts to develop a faint romantic feeling for her. However, Rika has a reason she must come to this place at all costs...