The third and final 'Heron Master Ippei' film.

Sequel to Heron Master Ippei.

A trio of fraudsters, Ippei, Saki, and Gen, who work seriously (?) every day with the motto, "My life is solidified with lies, I'm a serious hard worker!" They are geniuses when it comes to tricking people with their kuchihacchode haccho. The person they set their sights on is the director of Okawara General Hospital. There is no mercy for the unscrupulous doctor who uses exorbitant medical bills on the weak to fill his pocket and threatens to donate his organs if he can't pay them! Will Ippei and his friends be able to win a lot of money!?

In 1929 the fossil of a 500,000 year old man is discovered in China. In 1941 the Japanese army confiscates this find, but during the war the remains disappear. Based on these factual events, this movie takes off with a science fiction story involving a space rocket which places a satellite in orbit containing a secret cargo. The satellite crashes on a remote island and footprints are found in the sand leading away from the crash site. A story of how an ancient primitive cave-dwelling family contends with the scientists who want to study them.