The Super Sentai Official Mook 20th Century 1986: Choushinsei Flashman contains 36 pages of work commentary, world view & items, main characters, cast & staff interview of Futamizu Fujita (Jin/Red Flash) and Suzuki Takeyuki (Producer), and more. Super Sentai Official Mook 20th Century books have 11 issues, including the upcoming Flashman edition, covering teams from Battle Fever J to Gingaman with more to be released in the future.
Choushinsei Flashman starts out in 1966 where five children are kidnapped by the Alien Hunters as they wanted samples of humans from Earth to experiment on. The five that were rescued by the Flash alien race, each one of the five rescued children was taken to a different planet of the Flash solar system and trained separately from the others which would will allow them to fight the Reconstructive Experiment Empire Mess. In 1986, they return to Earth and transform into the Choushinsei Flashman to combat Mess who is now trying to invade.
The Super Sentai Official Mook 20th Century 1986: Choushinsei Flashman is priced at ¥680 yen (tax included) and will be released on May 24th, 2019.
Source: Lady Eve