Set in 1932, amid the rise of militarism after the establishment of the Manchukuo colony in Northeast China, the story centers on a trio of karateka. Studying under their aging master in a small dojo in the woods of central Kyushu, Choei, Taikan and Giryu face a company of kempeitai military police come to requisition their dojo for use as a military base.

Daisato, a second-rate, third-generation superhero, annoys his neighbors with the noise and destruction he causes on the job. But a heroic public image is the least of his concerns. Besides defending Japan from bizarre monsters, he must deal with an agent seeking to brand him with ads, a superhero grandfather with Alzheimer's and a family embarrassed by his incompetence.

Togashi, an enthusiastic marathon runner and his wife are occupied with their daughter Mayumi's grade school entrance examinations, but he becomes jobless when his company folds. To regain his confidence Togashi decides to join the marathon that is taking place on the very day of his daughter's examination and the all important interview.

At the end of WWII, Japanese doctor Akagi searches for the cure for hepatitis in the prisoner-of-war camp.