The U.N.G.C.C. (United Nations Godzilla Countermeasure Center) recovers the remains of Mecha-King Ghidorah and construct Mechagodzilla as a countermeasure against Godzilla. Meanwhile, a giant egg is discovered along with a new monster called Rodan. The egg is soon found to be none other than an infant Godzillasaurus.
Momo, a high school student, is torn between two love interests, each of whom possess great qualities.
Tamahiko Shima has been exiled to the country because of his disability, but the sudden arrival of an arranged bride upends his lonely life.