Taihei has unusual sperm, which was discovered during his captivity during the war. As a result, and of his children will be born with a new “third sex”. He made a promise to have all of his sperm frozen fro a mad scientist – a promise he made simply to survive the war. It’s now many years later and Taihei has survived and has a life and wife of his own. But all of that sperm has been used to create new children.