Mud Men(1975)

Mud Men

The last frontier, New Guinea. To uncover the secrets of the Gawan tribe living there, anthropologist Shinohara brings the chief's son, Kodowa, back to Japan. From that moment, strange incidents begin to occur, and Shinohara loses his life. His daughter Namiko heads for New Guinea, as if guided by Gawan mythology. After reuniting with Kodowa, Namiko is struck by even more bizarre events... An ambitious comic that delves into the mystery of the world's beginnings based on flood myths.

(Source: Chikuma Shobo, translated)