Set during the Meiji period (1868-1912), Kaede is the former mistress of a wealthy merchant. When he dies, she is forced out on the street and forced to give up her young daughter to the merchant’s family.

The Flashman find themselves protecting a puppy targeted by Mess due to it being the weakness of a chimera Beast Warrior.

Big Rally! Titan Boy! is the second movie of Choushinsei Flashman. It is a theatrical edit of episodes 15 to 18 (The Giant Robo is Worn Out, The Human Minimini Plan, The Mysterious Giant Reckless Car! and Big Turnaround! The Transforming Robo) with new and extended scenes.